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"htc desire hd not turnig on since last charged"に関する回答 2015年02月22日
Change your battery.
"Network wifi lan problem and volume bottons"に関する回答 2015年02月22日
Here, you can try this fix:Fix HTC DesireHD Signal problem
"My phone stuck on HBOOT"に関する回答 2015年02月22日
Weird. Why don't you use a tool instead of trying with the buttons. Check:Easy Ace Rootkit Still seems a malfunction of the board, but you can try. In the worst case you can get a replacement of the board. Saludos.

Xiaomi Mi Speaker (NDZ-03-GB) Disassembly 2020年05月09日

Thanks for sharing this!! I need to change the battery. It last 40 min now.