Wyze Cam V2 unresponsive after upgrading firmware

I have 2 Wyze Cam V2 for, both had firmware demo_V2_RTSP_4.28.4.41.zip installed on it for years. It happened that the 12 seconds recording attached to my Plan “Cam Plus Lite” was not working anymore as I had a message saying that my firmware was out of date/not supported when trying to assign my Wyze Cams to the plan. So, I decided to update the firmware. The flash method was the only one possible, it was a success for the first one (along with the attachment to Cam Plus Lite service) and a failure for the second one.

I tried many things -spending hours-, installing all the available firmware versions: Some make my Camera keeps having the light yellow ON when plugged in and goes in a booting loop, others causing the flashing blue/yellow light. In either case, I cannot go to the Ready to Connect step to have it recognized by the Wyze App when pressing the Setup button… What is funny is that with the flashing blue/yellow light state, my camera records on the SD card, so my Camera is functioning somehow !!! . I am pissed because I didn’t want to do the update but was forced to do it … So my assumption is that some internal files (boot, config) are corrupted