Success.
With FT40 ATJ1 I was able to downgrade also the Bootloader sboot.bin:
COMBINATION-FT40_R500XXU1ATJ1.tar. md5
All things alive and working... like BT and WiFi...
Now flashing again ETI1... to have all parts valid for FOTA Action... later...
And/or to rebuild ETL2 files.. BL part...
Best Regards
With FT40 ATJ1 I was able to downgrade also the Bootloader sboot.bin:
COMBINATION-FT40_R500XXU1ATJ1.tar. md5
All things alive and working... like BT and WiFi...
Now flashing again ETI1... to have all parts valid for FOTA Action... later...
And/or to rebuild ETL2 files.. BL part...
Best Regards