![]() This will take a long time.ġ5) Phone should then boot up in WWE mode. Use volume and power to start the process. ![]() Boot back into Fastboot.ġ4) You should be prompted to install the RUU. Save the updated disk imageĭd if=/sdcard/sdf1.img of=/dev/block/sdf1ġ1) Boot into download mode and verify your updated CID by running:-ġ2) Prepare an SD card with the RUU in the root of the card, renamed as 2Q4DIMG.zip.ġ3) Power off phone & insert SD card. You'll need:-ģ) Boot into download mode, connect your phone via USB and run (just for reference):-įastboot flash recovery twrp-3.2.1-2-ocm.imgĦ) Select Advanced -> Terminal and enter:-ĭd if=/dev/block/sdf1 of=/sdcard/sdf1.imgĨ) Open the image in HxD and locate HTC_621. Sorry I forgot to post full instructions - here they are:-ġ) Download all the relevant files. There are many things in the extracted image, maybe some encrypted data is hidden inside. If you made a dd if/dev/sdcard1 of/dev/sdcard2 count2, changes are very hight that blkid /dev/sdcard1 will be identical to blkid /dev/sdcard2. This is much different to the CID or serial number. SD card CID number can be changed with Linux on suitable notebooks or other Samsung EVO CID change tools. I noticed that there is also a cid in sde1, but modifying it does not make me to pass the checking of HTC.Īfter I failed on flashing the other RUU pack, I restore cid, mid and version number, and I pass the checking this time, so I don't think modifying them will cause trouble. whatever blkid returns will change whenever the data stored on the SD-card changes. ![]() The flash it back to the sdf1 partition byįor changing version number to downgrade, here is the link: The flash it back to the sdf2 partition byĢ.Open the image file by text editor, find the cid of your phone. I hope people who are familiar with these can find things that I didn’t notice.Ģ.Open the image file by hex editor, find the mid of your phone. The following is the method of modification. It seems that HTC has some cryptographic verifications for this, so I cannot modify everything. The software should load for a few seconds then provide the SD cards CID in the 'Product Serial Number' field. I successfully done this today, but I encountered some problems while flashing the RUU pack. Click on the drop-down menu at the top of the program window to select your SD card from the list of available drives. After the last time I successfully downgraded by modifying /dev/sde1, I tried to modify cid and mid in the same way. ![]()
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