Pondrew, I didn't know that differend brands use completely different numbering systems on their ROMs. As you say, QTEK Roms seems to be always 1.xx while Orange are always 2.xx for example. I discovered this also, on a french smartphone site that lists all the roms for HTC Voyager, from all operators / brands.
I was trying with my questions, to know if there is some rule on mixing brands with ROMs (I said "coupling" but maybe this was not the right word, I'm italian...).
To make it clear, you know: if you have a "PC" you can probably install any version of Windows, but if you have a MAC, you can't !
So I was puzzled by this question.... if QTEK 8080 is the same hardware as SPV E200, why they shouldn't both accept the same ROM ?
I think that probably in this phone (and others) there is something "deeper" or hidden, that may block your attempts (to load another brand's rom) even if that is a "low level" activity. Going back to PCs, if you boot with a floppy, and ask "Format C:", nothing can block you... (I think)
Anyway, thanks again for you help. After explaining to my friend that this thing probably voids his warranty, I've tried to load Orange 126.96.36.199 Rom, and all went fine. 5/6 minutes and his phone rebooted with the new ROM.
So, for anyone interested:
ROM Orange 188.8.131.52 loaded on QTEK 8080, ROM 184.108.40.206 >>> OK !