My HTC One m8 (Sprint) shows this on the screen and refuse to hardr reset or do anything else. Do I have to install a new ROM ? if yes, which ROM can I install through SD card cause the phone isn't connecting to the computer.
You can flash RUU 4.25.651.14. Either SD card method should work, or the .exe method. Your computer should still be able to connect via fastboot (which is how the RUU.exe works), even though it can't access storage. This is normal and expected - you can only access storage or adb while booted to OS or custom recovery TWRP.
RUU file and instructions here:
Alternately, you can update to Marshmallow with RUU 6.20.654.3, but you will need to fastboot flash firmware 6.20.654.3 before you can run the RUU. Instructions on flashing firmware also on the linked thread.
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