Unable to unlock bootloader for HTC 816G android phone I unable to unlock the bootloader for HTC 816G. I am trying to do this on a windows 10 laptop. The issue is that when I enter command 'adb devices', there is no device found when the phone is on fastboot mode. However, the same command works when the phone is on normal boot mode. I have installed HTC Sync and there seems to be no issue with driver. However, I tried to manually update the driver to "Android adb device" but issue persisted. I can see the phone serial number when I run 'fastboot devices' when phone is on fastboot mode. I tried to do this on an Ubuntu machine and still the same. Please assist.

Do let me know if you require any more details.
I only have experience with an old HTC Wildfire S so please be patient with me here...

• The first step towards unlocking Any HTC  bootloader is to make an official account with HTC Dev.    HTCDev.com      

( Become a HTC Developer -  so to speak )

• Secondly you need to Unlock the bootloader using the official HTC Bootloader unlock tools... 
 HTC Dev.com/bootloader   

The process usually goes as follows...


Enter Fastboot  
Enter Command fastboot oem get-unlock-token


You place the unlock token into the website and then it will convert the Token into a Token.bin or something like that ( unlock.bin ) i can't remember, i said bare with me... 


You place the (.bin) file next to your fastboot.exe program ( not ADB ) and then run   
fastboot oem unlock -pathToUnlock.bin  


You will get appropriate instructions on the HTC Dev site so don't worry about my crappy guide ;) ... 

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P.S
ADB is only uses while the device is "Live" .. Fastboot is used to flash things like the System...

ADB is a part of the system, Fastboot is part of the Boot... Different programs for different things.