# HL8548 CGATT=1 results in Unspecified GPRS error until CGATT=1 is called multiple times in a row **URL:** \ **Category:** Legacy HL Series\ **Created:** [April 10, 2019, 2:58pm UTC](https://forum.sierrawireless.com/t/hl8548-cgatt-1-results-in-unspecified-gprs-error-until-cgatt-1-is-called-multiple-times-in-a-row/16029 "2019-04-10T14:58:37Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![robvice](https://avatars.discourse-cdn.com/v4/letter/r/90db22/32.png) [@robvice](https://forum.sierrawireless.com/u/robvice)\ **Post date:** [April 10, 2019, 2:58pm UTC](https://forum.sierrawireless.com/t/hl8548-cgatt-1-results-in-unspecified-gprs-error-until-cgatt-1-is-called-multiple-times-in-a-row/16029/1 "2019-04-10T14:58:38Z")
HL8548 RHL85xx.5.5.25.0.201804161340.x6250\_2 Strange problem we encountered with attaching to the network with a roaming SIM card. We go through a cycle of calling +CGATT=1 and receiving an ERROR response. The next step we take is going through a detach process, this seems to exacerbate the problem we are encountering. If we do not go through the detach phase and call +CGATT=1 one or two more times, it will eventually attach and get out of the issue. When our device has the issue, it will rarely attach again unless we run through a different sequence. We are trying not to attach more than six times per hour in accordance with our carrier. However, the issue we see and the workaround we put into place may have us exceed this limit. Below is the recovery sequence form power-on of the HL8548: AT+CMEE=2 > > AT+CMEE=2 > > > > OK > > AT+CGATT=1 > > AT+CGATT=1 > > > > +CME ERROR: Unspecified GPRS error > > AT+CEER > > AT+CEER > > > > +CEER: “SM attach error”,111,“+NEER: Protocol error unSpecified : Cause #111” > > > > OK > > AT+CEER > > AT+CEER > > > > +CEER: “SM attach error”,111,“+NEER: Protocol error unSpecified : Cause #111” > > > > OK > > AT+CGATT=1 > > AT+CGATT=1 > > > > +CME ERROR: Unspecified GPRS error > > AT+CEER > > AT+CEER > > > > +CEER: “SM attach error”,111,“+NEER: Protocol error unSpecified : Cause #111” > > > > OK > > AT+CGATT=1 > > AT+CGATT=1 > > > > OK If there is nothing I can provide here, I can see about documenting our detach procedure. Keep in mind, for each time we run the module, we shut it down completely (remove power). ---
**Author:** ![Sierra\_klin2](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/sierra_klin2/32/4769_2.png) [@Sierra\_klin2](https://forum.sierrawireless.com/u/Sierra_klin2)\ **Post date:** [April 12, 2019, 3:34am UTC](https://forum.sierrawireless.com/t/hl8548-cgatt-1-results-in-unspecified-gprs-error-until-cgatt-1-is-called-multiple-times-in-a-row/16029/2 "2019-04-12T03:34:45Z")
Hi robvice, Could you check the following result and then try to select the network manually? ATI3 AT+COPS=? AT+COPS=1,2,“46001”,2 //UMTS ---
**Author:** ![robvice](https://avatars.discourse-cdn.com/v4/letter/r/90db22/32.png) [@robvice](https://forum.sierrawireless.com/u/robvice)\ **Post date:** [April 12, 2019, 2:34pm UTC](https://forum.sierrawireless.com/t/hl8548-cgatt-1-results-in-unspecified-gprs-error-until-cgatt-1-is-called-multiple-times-in-a-row/16029/3 "2019-04-12T14:34:11Z")
Hi Sierra\_klin2, Unfortunately, the problem is not easily reproduced. Additionally, we have many devices traveling the world so adding in the detection and network selection piece is a lot of overhead to maintain. AT+CGMR and ATI3 return the same result as I previously stated: ATI3 ATI3 RHL85xx.5.5.25.0.201804161340.x6250\_2 AT+CGMR AT+CGMR RHL85xx.5.5.25.0.201804161340.x6250\_2 When the problem occurs, is there any other command I can run to get details on the GPRS issue? ---
**Author:** ![Sierra\_klin2](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/sierra_klin2/32/4769_2.png) [@Sierra\_klin2](https://forum.sierrawireless.com/u/Sierra_klin2)\ **Post date:** [April 15, 2019, 8:53am UTC](https://forum.sierrawireless.com/t/hl8548-cgatt-1-results-in-unspecified-gprs-error-until-cgatt-1-is-called-multiple-times-in-a-row/16029/4 "2019-04-15T08:53:13Z")
I suggest waiting the new release of FW v5.5.26 and check if issue can be solved your side. ( A PDP attach/activate request reject issue was fixed in the new FW) ---
**Author:** ![robvice](https://avatars.discourse-cdn.com/v4/letter/r/90db22/32.png) [@robvice](https://forum.sierrawireless.com/u/robvice)\ **Post date:** [April 15, 2019, 3:44pm UTC](https://forum.sierrawireless.com/t/hl8548-cgatt-1-results-in-unspecified-gprs-error-until-cgatt-1-is-called-multiple-times-in-a-row/16029/5 "2019-04-15T15:44:44Z")
The issue has “bricked” devices unless the attach is called multiple times without going through a detach sequence. Is there an anticipated release date? I would like to run it on ~100 of our devices and see if the issue goes away with our firmware that raised the issue. ---
**Author:** ![robvice](https://avatars.discourse-cdn.com/v4/letter/r/90db22/32.png) [@robvice](https://forum.sierrawireless.com/u/robvice)\ **Post date:** [April 15, 2019, 3:48pm UTC](https://forum.sierrawireless.com/t/hl8548-cgatt-1-results-in-unspecified-gprs-error-until-cgatt-1-is-called-multiple-times-in-a-row/16029/6 "2019-04-15T15:48:07Z")
Note: This specific reply appears to be a hardware issue with the radio. I cannot get it to attach at all. On one device, running COPS=? returns AT+COPS=? AT+COPS=? +CME ERROR: no network service I suspect this one might be a hardware issue over what I have seen previously as it will always throw Unknown GPRS Error. I’ll try a few other things on it and see if I can get it to recover (possibly a new SIM) Additional issues around this particular device: AT+NEER (undocumented) returns no cell available or internal error. ---
**Author:** ![Sierra\_klin2](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/sierra_klin2/32/4769_2.png) [@Sierra\_klin2](https://forum.sierrawireless.com/u/Sierra_klin2)\ **Post date:** [April 16, 2019, 10:39am UTC](https://forum.sierrawireless.com/t/hl8548-cgatt-1-results-in-unspecified-gprs-error-until-cgatt-1-is-called-multiple-times-in-a-row/16029/7 "2019-04-16T10:39:36Z")
Could you try to see result of following? AT+CPIN? AT+CFUN? AT+CFUN=1,1 ---
**Author:** ![robvice](https://avatars.discourse-cdn.com/v4/letter/r/90db22/32.png) [@robvice](https://forum.sierrawireless.com/u/robvice)\ **Post date:** [April 16, 2019, 2:10pm UTC](https://forum.sierrawireless.com/t/hl8548-cgatt-1-results-in-unspecified-gprs-error-until-cgatt-1-is-called-multiple-times-in-a-row/16029/8 "2019-04-16T14:10:09Z")
On the troubled device (not the original reported issue here) running the above commands reports: AT+CPIN? AT+CPIN? +CPIN: READY OK AT+CFUN? AT+CFUN? +CFUN: 1 OK AT+CFUN=1,1 AT+CFUN=1,1 OK Calling CGATT=1 after this still results in unspecified GPRS error. I suspect the radio module is somehow damaged in this specific case. Again, the original reported issue is unrelated to this isolated one. ---
**Author:** ![Sierra\_klin2](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/sierra_klin2/32/4769_2.png) [@Sierra\_klin2](https://forum.sierrawireless.com/u/Sierra_klin2)\ **Post date:** [April 17, 2019, 3:38am UTC](https://forum.sierrawireless.com/t/hl8548-cgatt-1-results-in-unspecified-gprs-error-until-cgatt-1-is-called-multiple-times-in-a-row/16029/9 "2019-04-17T03:38:04Z")
Maybe you can insert the SIM into your mobile phone to see if it works? ---
**Author:** ![robvice](https://avatars.discourse-cdn.com/v4/letter/r/90db22/32.png) [@robvice](https://forum.sierrawireless.com/u/robvice)\ **Post date:** [April 17, 2019, 12:11pm UTC](https://forum.sierrawireless.com/t/hl8548-cgatt-1-results-in-unspecified-gprs-error-until-cgatt-1-is-called-multiple-times-in-a-row/16029/10 "2019-04-17T12:11:52Z")
I have tried multiple SIMs that do work in other devices. It’s definitely a hardware issue with this specific device. Again, remember, this one device is not related to the bigger issue as originally outlined. ---
**Author:** ![Sierra\_klin2](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/sierra_klin2/32/4769_2.png) [@Sierra\_klin2](https://forum.sierrawireless.com/u/Sierra_klin2)\ **Post date:** [April 19, 2019, 7:41am UTC](https://forum.sierrawireless.com/t/hl8548-cgatt-1-results-in-unspecified-gprs-error-until-cgatt-1-is-called-multiple-times-in-a-row/16029/11 "2019-04-19T07:41:31Z")
Hi robvice, I cannot help if a hardware issue. Regarding “AT+COPS=? +CME ERROR: no network service” issue, please try to restore all the NV default value including customer settings by AT+NVRST=2(a reset will happen automatically) to see if it can help. Or try to upgrade FW again. ---
**Author:** ![robvice](https://avatars.discourse-cdn.com/v4/letter/r/90db22/32.png) [@robvice](https://forum.sierrawireless.com/u/robvice)\ **Post date:** [April 19, 2019, 3:21pm UTC](https://forum.sierrawireless.com/t/hl8548-cgatt-1-results-in-unspecified-gprs-error-until-cgatt-1-is-called-multiple-times-in-a-row/16029/12 "2019-04-19T15:21:43Z")
Hi klin, no luck on the defective device with the NVRST=2 (again this one device is outside the original issue presented here). The original issue is still present on GOOD hardware. ---
**Author:** ![robvice](https://avatars.discourse-cdn.com/v4/letter/r/90db22/32.png) [@robvice](https://forum.sierrawireless.com/u/robvice)\ **Post date:** [May 3, 2019, 1:17pm UTC](https://forum.sierrawireless.com/t/hl8548-cgatt-1-results-in-unspecified-gprs-error-until-cgatt-1-is-called-multiple-times-in-a-row/16029/13 "2019-05-03T13:17:47Z")
Hi klin, What is the ETA for the 5.5.26 firmware? We would really like to put this on 100 of our devices and see if things improve. Thank you ---
**Author:** ![Sierra\_klin2](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/sierra_klin2/32/4769_2.png) [@Sierra\_klin2](https://forum.sierrawireless.com/u/Sierra_klin2)\ **Post date:** [May 5, 2019, 6:55am UTC](https://forum.sierrawireless.com/t/hl8548-cgatt-1-results-in-unspecified-gprs-error-until-cgatt-1-is-called-multiple-times-in-a-row/16029/14 "2019-05-05T06:55:07Z")
Hi robvice, Please try the enclosed FW 5.5.26\_2. Remove last “.7z” in the file name and unzip the two files. [RHL85xx.5.5.26.0.201905031309.x6250\_2.7z.001.7z](https://forum.sierrawireless.com/uploads/short-url/qEuGQxjIAWRi2xBnafrLWQ6eATG.7z) (3 MB) [RHL85xx.5.5.26.0.201905031309.x6250\_2.7z.002.7z](https://forum.sierrawireless.com/uploads/short-url/9x2HBlu5P30UqjTFT8ZwnoGHm4J.7z) (2.6 MB) ---
**Author:** ![robvice](https://avatars.discourse-cdn.com/v4/letter/r/90db22/32.png) [@robvice](https://forum.sierrawireless.com/u/robvice)\ **Post date:** [May 6, 2019, 1:50pm UTC](https://forum.sierrawireless.com/t/hl8548-cgatt-1-results-in-unspecified-gprs-error-until-cgatt-1-is-called-multiple-times-in-a-row/16029/15 "2019-05-06T13:50:43Z")
Are there preliminary release notes as to what is fixed in this version? ---
**Author:** ![Sierra\_klin2](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/sierra_klin2/32/4769_2.png) [@Sierra\_klin2](https://forum.sierrawireless.com/u/Sierra_klin2)\ **Post date:** [May 7, 2019, 7:17am UTC](https://forum.sierrawireless.com/t/hl8548-cgatt-1-results-in-unspecified-gprs-error-until-cgatt-1-is-called-multiple-times-in-a-row/16029/16 "2019-05-07T07:17:58Z")
FW 5.5.26 is not officially released yet. So I cannot provide the release notes. Please check if the 5.5.26\_2 can improve or not. ---
**Author:** ![robvice](https://avatars.discourse-cdn.com/v4/letter/r/90db22/32.png) [@robvice](https://forum.sierrawireless.com/u/robvice)\ **Post date:** [May 10, 2019, 4:14pm UTC](https://forum.sierrawireless.com/t/hl8548-cgatt-1-results-in-unspecified-gprs-error-until-cgatt-1-is-called-multiple-times-in-a-row/16029/17 "2019-05-10T16:14:08Z")
Good progress, we ran our firmware that initially identified the problem and have only had a few minor drops in connectivity (2 or 3 connections and recovered). None of our devices have been offline for the hours/days that the issue really created. This is great! The next big question, when might we see the 5.5.26 release? We’re looking to update our existing devices and update our manufacturing process to include the new HL firmware. ---
**Author:** ![Sierra\_klin2](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/sierra_klin2/32/4769_2.png) [@Sierra\_klin2](https://forum.sierrawireless.com/u/Sierra_klin2)\ **Post date:** [June 2, 2019, 9:43am UTC](https://forum.sierrawireless.com/t/hl8548-cgatt-1-results-in-unspecified-gprs-error-until-cgatt-1-is-called-multiple-times-in-a-row/16029/18 "2019-06-02T09:43:36Z")
Hi robvice, Good to hear the news. Please contact with your Sierra Contacts to know the exact schedule of official 5.5.26 release. ---
**Author:** ![robvice](https://avatars.discourse-cdn.com/v4/letter/r/90db22/32.png) [@robvice](https://forum.sierrawireless.com/u/robvice)\ **Post date:** [June 2, 2019, 4:52pm UTC](https://forum.sierrawireless.com/t/hl8548-cgatt-1-results-in-unspecified-gprs-error-until-cgatt-1-is-called-multiple-times-in-a-row/16029/19 "2019-06-02T16:52:11Z")
The Regional Sales Manager visited us recently and is looking into it for us. Thank you. ---
**Author:** ![robvice](https://avatars.discourse-cdn.com/v4/letter/r/90db22/32.png) [@robvice](https://forum.sierrawireless.com/u/robvice)\ **Post date:** [January 2, 2020, 4:22pm UTC](https://forum.sierrawireless.com/t/hl8548-cgatt-1-results-in-unspecified-gprs-error-until-cgatt-1-is-called-multiple-times-in-a-row/16029/20 "2020-01-02T16:22:56Z")
Sounds like this will be released in the near future…looking forward to it. [Next page](https://forum.sierrawireless.com/t/hl8548-cgatt-1-results-in-unspecified-gprs-error-until-cgatt-1-is-called-multiple-times-in-a-row/16029.md?page=2)