# Bricked PBS4222 firmware upgrade

**URL:** <https://community.na.baicells.com/t/bricked-pbs4222-firmware-upgrade/2389>\
**Category:** Products\
**Created:** [May 19, 2026, 5:37pm UTC](https://community.na.baicells.com/t/bricked-pbs4222-firmware-upgrade/2389 "2026-05-19T17:37:57Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Alluren](https://avatars.discourse-cdn.com/v4/letter/a/7feea3/32.png) [@Alluren](https://community.na.baicells.com/u/Alluren)\
**Post date:** [May 19, 2026, 5:37pm UTC](https://community.na.baicells.com/t/bricked-pbs4222-firmware-upgrade/2389/1 "2026-05-19T17:37:57Z")

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Hi,

I have an issue with PBS4222 femtocell, where I tried to upgrade firmware to BaiBS\_QRTB\_2.6.2.IMG. It seems that firmware file was incompatible and femtocell boots, but no web interface or anything loads. Link on the ethernet ports is blinking, so it is not a hardware issue.

I have seen on the web interface of the femtocell, that there is an option to rollback firmware, but as I said - no web interface is running currently.

My question - Is there any option to boot to debug mode and to restore previous firmware or to unbrick current device from the current state of femtocell?