I tried downgrading the HL7800 from 4.5.4.0 to 3.6.0.0. After process finished the AT interface does not respond. Connecting to the debug console the following is observed:
Boot>
Secured Boot ROM Console
Is there a way to recover this module?
Is your module activated secure boot (ATI9)?
<SBUB> Secure boot activation status for the bootloader
0 Secure boot not activated
1 Secure boot activated
<SBFW> Secure boot activation status for the firmware package
0 Secure boot not activated
1 Secure boot activated
If your module does not activate secure boot or downgrade the same signed firmware, please power on/off then check again.
If your module is activated secure boot with signed firmware 4.5.4.0 and downgraded to unsigned 3.6.0.0 firmware or other singed firmware, you cannot recover it. Please contact your distributor or submit “Contact Us” on https://www.sierrawireless.com/support/ for technical support in this case.
Can you give me the firmware name or link of 4.5.4.0,3.6.0.0 HL7800 firmware?