# SL8082T Firmware upgrade fail. Brick **URL:** \ **Category:** Legacy AirPrime modules\ **Created:** [September 16, 2015, 5:28am UTC](https://forum.sierrawireless.com/t/sl8082t-firmware-upgrade-fail-brick/8195 "2015-09-16T05:28:11Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![badboi84](https://avatars.discourse-cdn.com/v4/letter/b/53a042/32.png) [@badboi84](https://forum.sierrawireless.com/u/badboi84)\ **Post date:** [September 16, 2015, 5:28am UTC](https://forum.sierrawireless.com/t/sl8082t-firmware-upgrade-fail-brick/8195/1 "2015-09-16T05:28:11Z")
Hi, I have few units of SL8082T while upgrading from R7.50.0.A1 to 7.52.1.A5 on a few of the modules. the Update didn’t complete successfully. and now on ATI3 it will show "Sierra Wireless, Incorporated SL8082T APP3 OK" How will i be able to recover this? TIA ---
**Author:** ![davidc](https://avatars.discourse-cdn.com/v4/letter/d/a183cd/32.png) [@davidc](https://forum.sierrawireless.com/u/davidc)\ **Post date:** [September 16, 2015, 7:34am UTC](https://forum.sierrawireless.com/t/sl8082t-firmware-upgrade-fail-brick/8195/2 "2015-09-16T07:34:12Z")
Hiya, This looks like the bootloader is still alive. The bootloader only understands a couple of at commands and replies OK or ERROR to pretty much everything else. You should be able to attempt to reflash the firmware using the at+wdwl command and a 1k xmodem downloader. Have a look in the release notes for instructions on doing a serial flash update. This should work even though you miht be connecting across a usb port. You might have to go back a couple of versions to find the instructions though. Worst case, your distributor should be able to recover these using some of their internal tools. Ciao, Dave ---
**Author:** ![sushil](https://avatars.discourse-cdn.com/v4/letter/s/e19adc/32.png) [@sushil](https://forum.sierrawireless.com/u/sushil)\ **Post date:** [September 16, 2015, 8:02am UTC](https://forum.sierrawireless.com/t/sl8082t-firmware-upgrade-fail-brick/8195/3 "2015-09-16T08:02:40Z")
I think the answer to your issue lies in the note mentioned in section 5.3.2 of the firmware release notes ([http://source.sierrawireless.com/resources/airprime/software/release\_notes/firmware\_7\_52](http://source.sierrawireless.com/resources/airprime/software/release_notes/firmware_7_52)). > [@](#): > > Note: On AirPrime SL808xT with Firmware 7.50.0.A1, firmware (SIERRA\_OAT\_FW\_752\_68\_FULL\_sl808x) should be upgraded before bootloader (SIERRA\_BOOT\_S4.1.0.13\_sl808x) , if .cwe or .dwl files are used for upgrade. R7.52.0.201404040850.SL808x.exe can be used to recover AirPrime SL808xT in bad state. Have you tried using the exe file to recover the modules? ---
**Author:** ![ddean](https://avatars.discourse-cdn.com/v4/letter/d/7cd45c/32.png) [@ddean](https://forum.sierrawireless.com/u/ddean)\ **Post date:** [October 12, 2015, 5:47pm UTC](https://forum.sierrawireless.com/t/sl8082t-firmware-upgrade-fail-brick/8195/4 "2015-10-12T17:47:55Z")
In my experience ~10% of SL808xT modules fail to upgrade cleanly, corrupting the flash memory and causing the module to endlessly reboot. I’ve not had any success in recovering them, despite trying numerous methods. This must be a common problem, even if SW don’t publicly admit to it, because the the latest 7.53.1.A1 firmware includes some improvements where the module will detect successive restarts and enter a state where the corrupt flash memory can be overwritten. ---
**Author:** ![tank\_duan](https://avatars.discourse-cdn.com/v4/letter/t/8baadc/32.png) [@tank\_duan](https://forum.sierrawireless.com/u/tank_duan)\ **Post date:** [January 22, 2016, 2:31pm UTC](https://forum.sierrawireless.com/t/sl8082t-firmware-upgrade-fail-brick/8195/5 "2016-01-22T14:31:27Z")
yes…rigth SL8082T upgrade will be fail sometime .for R7.50 TO R7.53