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1. I'm not sure I understand the question correctly (aren't you asking the same thing in question 2?), but I think it's a 'yes'. You must change the Revolutionary HBOOT to another version, preferably an ENG version to install an RUU.
2. Yes, as long as the phone is S-OFF and rooted.
3. The one that works! There are two linked here. Both work. Some people get one to work and not the other. The md5sum differences are often due to developers adding their signatures to the HBOOT, nothing more. There is a way to flash the 2.* HBOOT directly over the Revolutionary HBOOT, although this involves adb and some risk. It might be safer for many to flash the 0.98.2000 ENG HBOOT, then flash the 2.* version.
4. Yes.
5. No. Flashing an ENG HBOOT won't by itself S-OFF an S-ON phone.
6. Either; whichever you feel more confident with or that works. The 'Android Flasher' tool is catching on, making the process simpler still for many people.
7. You can flash any RUU, so long as it's compatible with your phone. I think the reason why people suggested an early (or the earliest) version for the Desire S is because its radio was the best (most stable) of the Sense 2.1 ROMs/updates. The latest radios that come with the 2.* software number (e.g. Baseband 20.48.30.0822U_3822.09.08.20_M) are reported to be the best of all the updates.
8. Yes.
9. Yes, you can find that information with your CID. If you gave the right CID, then HTC__016 means your phone is branded; specifically, Vodafone, South Africa.
This displays the CustID Code as HTC__ (and a number). If these numbers are the same as included in the cidnum value in the file android-info.txt, your device is unbranded. I have noted the following cidnums are unbranded: HTC__001, HTC__E11, HTC__N34, HTC__203, HTC__102, HTC__K18, HTC__405, HTC__Y13, HTC__A07, HTC__304, HTC__016, HTC__032. I'm not sure whether it is an exclusive list. To find out if an RUU is compatible for your ROM, the value displayed by fastboot oem gencheckpt has to be included in the cidnum list of the RUU. If it isnt included, you will need to use a goldcard to bypass the cidnum checks done by the RUU.
modelid: PG8810000
cidnum: HTC__001
cidnum: HTC__E11
cidnum: HTC__N34
cidnum: HTC__203
cidnum: HTC__102
cidnum: HTC__405
cidnum: HTC__Y13
cidnum: HTC__A07
cidnum: HTC__304
cidnum: HTC__016
cidnum: HTC__032
mainver: 1.47.401.4
hbootpreupdate:13
DelCache:1