Hi, I have an RV50X that has been unable to establish cellular communications since being powered on following a two month period without power. After a lot of troubleshooting I think I’ve narrowed down the problem to the radio module. This is based on the elimination of other causes and the following log messages:
Radio Enumeration Failed... The only available port(s) is/are ttyUSB0 cannot open /dev/ttyUSB2 to issue AT /dev/ttyUSB2 is BUSY while checking for Radio Radio module is operating in boot-and-hold mode Radio module is disconnected RecoverRadioModuleFirmware: failed to start SDK QCWWAN2kEnumerateDevices - Return Code [6]
The logs also show ALEOS attempting automatic radio recovery using MC7455_02.33.03.00_GENERIC_002.072_001.iso but the recovery never completes and the radio returns to boot-and-hold mode.
I have factory reset the modem and am still getting this issue. The modem is running ALEOS 4.18.2 and radio firmware 02.33.03.00 (generic). I have a SIM to install and configuration file to upload (both of which were working prior to the two months without power), but have not attempted this since the factory reset as I understand the radio issue to be more fundamental.
Has anyone encountered a situation where an MC7455 repeatedly enters boot-and-hold mode and only enumerates ttyUSB0 after an extended power-off period? Is there a supported method to force a radio firmware recovery/reflash outside of the standard ALEOS recovery process? Any guidance or thoughts would be appreciated!
I understand the problem. I have not had this before with an RV50X but I had this issue with a standalone radio module. With the standalone radio module, we had to use an application to fix it.
In another case here at this forum, we had a similar but not exactly the same issue.
In the other case, none of the ttyUSB ports could enumerate.
The Semtech support contact suggested the following,
" So, could you please try to put your device into Recovery mode following the instructions in the Recovery mode section of the Software Configuration User Guide for AirLink RV50X ( source.sierrawireless.com/resources/airlink/software_reference_docs/airlink-rv-series—configuration-guide/#sthash.GIya0GWh.dpbs) and let me know the result. "
The other case was this one, had this title,
Setting-up-modems-for-the-field-issues
Maybe try the recovery module suggestion until Semtech support responds.
Thank you for the info. I went through recovery mode successfully and the modem is now at factory defaults with no SIM installed. However, the radio still fails enumeration. The log shows:
- IMEI = NOTSET
- Radio SN = NOTSET
- Radio FW Version blank
- only ttyUSB0 enumerates
/dev/ttyUSB2 unavailable- recurring “Radio module is operating in boot-and-hold mode”
QCWWAN2kEnumerateDevices - Return Code [6]
Recovery Mode reports “No Radio Module Firmware Update pending” but the radio never leaves boot-and-hold state. Previously ALEOS could at least retrieve the Radio SN, IMEI, and radio firmware version. Recovery mode was not a fix but did change things are provide more information. I’m optimistic that if you were able to fix your standalone radio module then there is a solution to this as well.
I understand. Alright, I suggest we wait then for a response from Semtech support, @jerdung
I think he is sleeping now but back in the office tonight when we sign off.
I have another suggestion - capture and post a log from this RV50X. I think jerdung is going to ask for it.
Thanks for the suggestion, as a new user I cannot upload attachments but have logs ready for whenever that clears or to share via link.
Hi @john.taylor,
Welcome to our community!
Based on log you provided, I noticed that logs describe failures during detection and hardware/firmware status-checking process between the ALEOS operating system and the radio module inside the RV50X router.
The radio module appears to have entered a boot-and-hold state.
In order to have the full view about these behaviors, could you please provide the template file and full log file covering the period from two months before the power down until the device was powered back on?
You can upload the files to Google Drive and then share link with me.
***Here are the instructions for obtaining log file and template file:
- The configuration template file can be found in ACEmanager → Template. Provide any desired name for the Template Name, and then press Download to retrieve the template file.
- Obtain the log file:
a. Go to AceManager > Admin > Log > Configure Logging.
Set all log levels to DEFAULT (NOTICE).
Set Linux Syslog to DISPLAY.
Then select Apply.
b. Reboot the gateway.
c. Go to Admin → View log → Download Logs.
Thanks,
Hi, thanks @jerdung !
I have uploaded to Google Drive the current log file and template file (dated 2026-08-19) as well as the template file that was active when the issue was first encountered (dated 2026-04-23). Please let me know if there is anything else I can provide.
Files are saved here: https://drive.google.com/drive/folders/1okoftdzK-lpsbpdRuBHWHIZoetzYEeiF?usp=drive_link
Thanks!
Hi @john.taylor,
I can’t access the link you provided. Could you please make the link public so that I can access it?
Thanks,
Hi jerdung, the link should work now. Thanks!
Hi @john.taylor,
From the logs you provided, I can see a series of “Radio Enumeration Failed” errors.
*Line 135: Sep 9 00:00:11 notice ALEOS_CELL: Radio Enumeration Failed...The only available port(s) is/are ttyUSB0*
*Line 193: Sep 9 00:00:31 notice ALEOS_CELL: Radio Enumeration Failed...The only available port(s) is/are ttyUSB0*
*Line 194: Sep 9 00:00:31 alert ALEOS_CELL: Radio Enumeration Failed...Retried 20 time(s)*
*Line 195: Sep 9 00:00:52 notice ALEOS_CELL: Radio Enumeration Failed...The only available port(s) is/are ttyUSB0*
*Line 310: Sep 9 00:02:21 notice ALEOS_CELL: Radio Enumeration Failed...No Serial Ports Available*
*Line 328: Sep 9 00:02:40 notice ALEOS_CELL: Radio Enumeration Failed...The only available port(s) is/are ttyUSB0*
*Line 329: Sep 9 00:02:41 alert ALEOS_CELL: Radio Enumeration Failed...Retried 20 time(s)*
*Line 334: Sep 9 00:03:01 notice ALEOS_CELL: Radio Enumeration Failed...The only available port(s) is/are ttyUSB0*
*Line 335: Sep 9 00:03:01 alert ALEOS_CELL: Radio Enumeration Failed...Retried 40 time(s)*
*....*
qmisdkhelper indicates that the module is currently running in boot-and-hold mode.
Sep 9 00:01:38 notice ALEOS_FIRMWARE_rmswitchingcheck: (qmisdkhelper) Waiting for the Radio Module to be ready*
Sep 9 00:01:38 err ALEOS_FIRMWARE_rmswitchingcheck: (qmisdkhelper) Radio module is operating in boot-and-hold mode*
Since no firmware is found stored on the device, the module cannot be recovered.
Line 2535: Sep 9 00:02:11 err ALEOS_FIRMWARE_RmUpdater: Could not find any firmware in the radio store - radio store empty*
Line 3043: Sep 9 00:02:12 err ALEOS_FIRMWARE_RmUpdater: Could not find any firmware in the radio store - radio store empty*
_________________________________________________________
Therefore, please try reinstalling the firmware to see if this improves the situation:
Go to Admin > Radio Module Firmware and check the Firmware section to see whether any firmware information is displayed.
If not, install the firmware as follows:
1. Download the appropriate Radio Module Firmware for your RV50X from source page at the following link: source.sierrawireless.com/resources/airlink/software_downloads/rv50/rv50x-firmware-list/
2. Click Install button under Admin > Radio Module Firmware > Firmware.
3. Select the firmware file you downloaded in Step 1, then click Install.
4. Wait for the module firmware installation to complete successfully.
Thanks,
