If I try to update with a newer firmware (RUT9_R_00.07.06.19_WEBUI.bin), I get "Update in progress, the signal LEDs flash one to one then all the LEDs flash simultaneously annd never stop.
“ RUT955 devices with MeigLink SLM750 module are only supported on firmware version RUT9XX_R_00.06.08.5 and up. You can find the module present on your device in Device (legacy WebUI) WebUI page. “
Could you please confirm that you downloaded the firmwares from our official wiki: RUT955 Firmware Downloads - Teltonika Networks Wiki?
If I understand correctly, after uploading both the legacy and RutOS firmware to the device, you see the error “incorrect firmware file,” is that right?
Unfortunately, it looks like a hardware issue with the device. If your device is still under warranty, please contact your distributor to initiate the RMA process.
From the screenshots you provided, this appears to be the new bootloader menu, which means it does not require an update itself.
However, we can investigate this issue further. For that, I will need some sensitive information from you. I have sent you a form to fill out, and once it is completed, I will contact you privately regarding this issue.
When filling out the form, please use ticket ID “15087”.