[P3600 Software Upgrading] esziszi:
1.46.00->1.46.30->1.50

Ok people, here are my (incomplete) findings:

Had 1.46.00, flashed 1.50, then 1.46.30, then again 1.50. The report is for 1.50.

Phone: less sensitive. 3G has lower sensitivity in my appartment, in some places of the appartment the received voice is choppy, but the call holds. Some regular mobile phones do that too, some not. 1.46.00 was better in this regard, I think.

GPS: more sensitive. Sees more satellites. Lock seems faster, but I'm not sure. Not sure about the precision, either, if it is better or worse. But the sensitivity is better, I get a lock indoors, next to the window, with two stories on top and another flat across the street. Never happened before.

GPS quirk: at first use after flashing, the altitude was shown double the real value. Not navigation software bug, I tested this in two different programs. Soft reset, now it's ok. Still very sensitive.

WiFi: maybe faster connect, but not sure. At least as sensitive as it was.

Bluetooth: does not turn off by itself, although I did not test 1.50 long enough to be sure of this. The 1.46.00 version (or the OS ROM, maybe) turned off Bluetooth randomly. Have to test A2DP Bluetooth stereo, had high quality but low range with the previous version.

Battery life: seems better, even with GPS usage, but too early to tell. 1.46.00 ate the battery under GPS.

Conclusion: seems like I will have to choose between phone or GPS. Maybe I'll revert to 1.46.00, or better 1.46.30 (good compromise between phone and GPS, maybe?). Proud to have GPS lock in the appartment, but never needed that kind of GPS sensitivity on the road. I do need good GSM, though.

Anyway, thanks for sharing these ROMs. It's probably true that one ROM or another is better for one operator or another. I wonder what the coverage and network technology is like in Taiwan, compared to mainland China, Europe, US, Russia etc. I suppose the various and newer ROMs are optimized for less interference between GSM/WIFI/BT/GPS, but also finetuned for the specifics of each network and terrain.

Oh, and I'm on Orange Romania, with mun_rus' INDIGO Lite WM6 English ROM, using an unbranded HTC P3600.

PS: my black Trinity is peeling off, too, but I depend on it it and don't really want to send it in. Oh well, I will do it someday.

EDIT 1: A2DP stereo Bluetooth and AVRCP Bluetooth remote control still work. Range seems better than with 1.46.00: was about 3 meters, now about 5m, but the range increase may be because I tested the new ROM at 2 o'clock in the night, commercial radio interference is much lower than during daytime. By the way, I use a Siemens HHB-750 Stereo Bluetooth Headset, cost about the third of a Jabra 620 or Nokia 501. Sound quality is great, can use other headphones, called/calling number shows on its LCD, uses one AAA battery, has AVRCP remote control buttons. So, I can confirm that Trinity Radio ROM 1.46.00.11 and 1.50.08.11, combined with mun_rus' Trinity OS ROM version INDIGO Lite do work well with the Siemens HHB-750 Stereo Bluetooth Headset. Probably the other posters here don't care, but maybe some poor soul finds this on Google. I know I couldn't find anything about this headset but got it anyway. Don't know about its battery life, though. Maybe I'll make a 3.5 adapter from the original cabled headset, after all...

EDIT 2: phone radio improved in 1.50? I just got a call in my apartment, the phone was in 3G mode; at first, the call was a bit choppy, but then it changed to good. When I hung up, it was in GSM mode. It seems that this radio ROM (1.50) makes the phone more sensitive, so that it holds the 3G connection in standby, in my apartment, while the 1.46.00 version switched between GSM and 3G, depending on the room the phone was in. With the 1.50 ROM, the conversation started in 3G, then Trinity switched to GSM and all went well. Maybe the phone radio is better as well, with this ROM, not only the GPS radio. It's nice that Trinity switches automatically between 2G's (GSM) 900MHz and 3G's 2100 MHz bands, depending which is more stable. Never thought of 3G as a way to overcome GSM signal issues.

EDIT 3: battery life a bit more than 120h in 3G standby, under bad coverage. HTC specifies 180-200h in 3G.