Originally Posted by redpoint73
Updating TWRP within TWRP requires v2.8.4 or later already installed, as clearly stated on the official TWRP website: https://twrp.me/htc/htconem8gsm.html
For flashing TWRP, it isn't adb you want, it is fastboot. adb and fastboot are related, but 2 different things. For fastboot to work, you want to be on the bootloader screen (not TWRP or OS) with "fastboot USB" selected. Then use the command to test: fastboot devices
Keep in mind, what TWRP version you update to, depends on what OS version you are trying to restore. What OS number does it indicate on the bootloader screen (or if blank, what hboot number and what radio number?).
If you can get fastboot working, do fastboot getvar all, then post the output (delete IMEI and serial number) so we can see more info about the device.
---------- Post added at 09:54 AM ---------- Previous post was at 09:46 AM ----------
That is one main reason I discourage folks using these random "root" websites (unless you know it is correct and reputable), and/or following YouTube videos to mod your phone. These things almost always are lacking a lot of critical nuance and detail. And they show you just enough to get yourself into trouble, without the proper tools or knowledge to get out of that trouble.
XDA is the best place for knowledge about custom recovery, root, etc. Not only is all the info you need on here, but we have a healthy active community, that is willing to help you when you have troubles or questions.
Case in point, the stock TWRP backup OS files are all right here, sticky thread at the top of this forum section: https://forum.xda-developers.com/htc...-twrp-t3086860
outcome: "fastboot getvar all"
adb server version (31) doesn't match this client (40); killing...
* daemon started successfully
oot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 3.19.0.0000
(bootloader) version-baseband: 4.0.U605611@50319A
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul_ca
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B12000
(bootloader) cidnum: 11111111
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: off
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: 205bdca3
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
Finished. Total time: 0.113s