[konsulex]

I have a Kobo Aura HD that developed an issue with the original system. To try to fix it, I opened the device, replaced the internal microSD card, and flashed a firmware image that was provided to me from this site.
The image used was Kobo_N204B_Aura_HD.

The device boots normally, the e-ink screen displays a perfect image, and it reaches the language selection screen, however the touch does not respond at all.

Some important points:

The screen works normally (perfect image, no artifacts)

The issue is exclusively with the touch, completely non-responsive

The Kobo was working normally before the software issue

After replacing the microSD and installing the firmware, the touch has never responded

I have already considered poor contact, but it does not appear to be the digitizer (touch) flat cable, which is the thinner one

My main questions are:

Is this symptom (image OK, touch completely dead) typical of incompatible firmware on the Aura HD?

Can anyone confirm which .img image is the correct one specifically for the Kobo Aura HD (N204B / dragon)?

Is there any additional test I can perform to reliably distinguish between a firmware issue and a physical digitizer failure?

Is there any known way to fix this issue?

Any guidance would be greatly appreciated.
Thank you in advance.