I am fairly new to HTC and Android in general so any help would be very appreciated. I noticed similar situations by other users on here but for some reason those did not resolve my situation. I have called HTC Support about it and in two days time I can send it out but it does say TAMPERED and UNLOCKED at the top of the Bootloader screen.
Here is more information about my phone that may help:
AT&T HTC One M8
TAMPERED / UNLOCKED
(I have downloaded the stock recovery for this but while trying to perform the FASTBOOT or ADC commands in Terminal, it states that no devices are attached and yes I have the drivers installed along with Sync Manager. I have done it on multiple computers and operating systems using both 2.0 and 3.0 USB but still nothing. I have tried the two toolkits in the INDEX section of this HTC One M8 but neither recognizes the device.)
The phone is S-On
(fairly new to rooting so not sure if it has to be S-Off to side load a ROM, I tried a tutorial for making it S-Off but I have to set a number of settings which I cannot since I can't access the home screen settings of the phone)
It had the Revolution ROM on it before the reset by Mike... not very familiar with ROMs.
I have tried the SD Card method but get errors and results in FAIL.
I have used the toolkits as well as the MANUAL way of doing things but neither recognizes the device whether in recovery, boot loader, or HTC Logo screen.
Thanks in advance for any and all the help.