Thanks in advance
Hi,I want to install custom rom. (like most people) but, With htc one m7 I used the warranty, so, I want to be able to use it with the M8. My question is. to return full stock, its need s off right? Right now I cant afford 25 for the soff (in my country, outside of USA is a little more difficult because the conversion). So, if I use the dev unlock bootloader, Can I install custom any rom ( i ask because I dont know where I saw custom rom requiring S-OFF) and then do the s off after a while (maybe 2 o 3 months). If I use dev unlock from htc, they will be able to track that I install custom roms?
Ok, so I think that I will save mone for S-OFF, better play safe. Just a question, to update firmware I need to RUU? (After S-Off of course) Or can you point me to a guide to flash latest sense and lollipop rom? (I know how to flash recovery, s off, etc. but not sure about the match of firmware or what firmware/radio to use).
You can update firmware (after s-off) with AT&T Lollipop RUU, or by flashing a firmware.zip in fastboot.
Flashing AT&T firmware will keep the same band support. If you want to change the band support, you can flash another version's firmware. But it depends on what bands your carrier uses for 3G and 4G (LTE).
EDIT: I'm preparing , found some firmware but cant see from wich carrier are. Are those https://www.androidfilehost.com/?w=files&flid=32780
You are somewhat correct, in that before the M8, band support was set in hardware on most (or all?) phones.
But a new feature of the Snapdragon 801 chipset, is that band support is set in software. Flashing another CID's firmware will change the band support (may need to change CID and MID, and s-off required to change CID/MID).
AT&T is 502. But that thread only has 1.54.502 (which is same or probably even older than current firmware), and what you want (latest) is 4.28.502.
You can get the 4.28.502 firmware on the following thread, but you have to download the ROM with it (all packed in the same zip):
Not sure if 4.28.502 firmware is posted by itself anywhere else (I haven't seen so).
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