This might help all the HTC One India Users in future.
I bought my HTC One m7_U 7 months ago and installed Google Play Edition Rooted RUU on it provided by htc1guru
I changed my CID and MID to install the RUU on my phone and was happy with the Google play edition of the phone till the day my phone's Microphone stopped working and so did the Compass sensor. I also had the Purple Tint Issue with the Camera so I thought Of giving it back to the customer care for a replacement.
Now I started a search for my native Stock ROM that is for the HTC One WWE indian single sim edition(We in india have a dual sim edition also).
The basic step to revert back to stock was to revert back to the original CID which was HTC__038 and Model ID PN0711000.
When searching for the stock roms, I found three options:
1: Install RUU from htc1guru's collection
which matched the CID and ModelID of India's HTC One models.
2: Reset my phone using htc1guru's collection
which also matched the CID and Model ID.
3: Install Nandroid Backup for CID HTC__038 which is not available nowhere.
Trying First Option:
Since The RUU was available I first tried to Install the RUU and installed it successfully but the Software information In About Phone Showed that I am running 3.63.707.3 instead of 3.63.707.4. And the fastboot getvar mainver showed me 3.63.707.4.
Now the issue was OTA. I installed Stock recovery for the OTA in hopes of installing the recent OTA updating HTC One from 3.63.707.4-4.20.707.7. When I searched for the software updates available it showed me the available update as 4.20.707.6. I anyway started to download it and as soon as the download completed the phone gave me the message "we have determined that your phone may be running a modified version of its system software. For your protection we cannot update your phone.
Please revert your phone to the official HTC system software....."
Trying Second Option:
Now the GURU reset seemed to be the last option for me. But after installing it using ClockworkMod and Aroma Installer, The issue was exactly same like the one in RUU. The Software information in the about phone menu showed 3.63.707.3 and the fastboot getvar mainver showed me 3.63.707.4.
So finally I gave up and wrote this thread. Please help me if anyone has any idea about why these RUU's are showing a different firmware.