[ZTE Axon 7 Questions & Answers] Ekol98:
Dear All,

ZTE Axon 7 A2017 (Chinese version) Stuck on Bootloader mode.

Device after power on will Stuck on ZTE logo even power button press longer also will Off and came back to square one and the only way to power off is via selection on bootloader page via volume button which consists of Recovery mode, Power Off, Bootloader and some other mode which I can't recall.

History of this issue. Please bear with long story.

Manage to install MM ROM with B13 via sd card installation via update software in phone setting. follow by Unlocked bootloader and Install TWRP 3.1.1.0 then try few different ROM until one day when I use Xiaomi flashtool my PC crash half way through during flashing resulting in device with Pure Chinese ROM and TWRP also got corrupted, when I said corrupted because I install TWRP 3.1.1.0 but when I go to Recovery mode it shows TWRP 3.0 something. with this corrupted TWRP when I try to install ROM it will show loading but end result is NIL meaning same ROM nothing change.

Until this stage I never did a TWRP backup because all this while the ROM is Not my type of ROM from this junction when I boot back to TWRP and I did Advance Wipe most of it except external sd card thinking that I may be able to install fresh TWRP but my Recovery TWRP is residing in phone storage resulting in No more TWRP recovery software. next thing I did was I connect phone to PC and ran adb fastboot tool to detect device and managed to detect device in recovery mode and I make decision to Locked back the bootloader and did just that and Locked bootloader is Succes and it also Erased everything during the process.

To cut short the story after Locked back bootloader only Bootloader mode is accessible and when I connect to PC and enable Recovery mode (Black screen) and EDL mode (Black screen) from Windows PC Device Manager COM port able to see Qualcomm 9008 for this 2 mode.

I must admit after few days of trying to resolve this Stuck Bootloader issue I almost give up.

Then I remember this Woodo magic by jcadduno which recommends XM flashtool version 2016.08.30.0 but unable to flash after trying few version Xiaomi flashtool and the very latest and I mean from Xiaomi Flashtool webpage http://xiaomiflashtool.com/

version 20170425 that break the ice and finally able to load A2017U ROM because this US ROM my phone No Network detected.

From here onwards I unlocked bootloader and install back TWRP (Installation of TWRP via Axon7toolkit) because of Network issue since I got TWRP I install back A2017 ROM but still Not satisfied because Chinese ROM certain Apps having issue because of Google services and I chance upon this Conversion A2017 to A2017U ROM (Hybrid ROM caused ROM is US and Modem from Chinese Modem)

that I'm stay put right now and my phone now is A2017U model.

I hope this experience can help others with similar Stuck bootloader and those who wish to convert A2017 to A2017U ROM.

below is the link that I described Woodo magic.

https://xdaforums.com/axon-7/development/edl-emergency-dl-mode-twrp-unlock-t3553514

Straight forward Axon7toolkit, please don't use Chrome browser cause Chrome will Automatically Delete it after complete download for my case I used Microsoft Edge.

https://xdaforums.com/axon-7/development/tool-axon7toolkit-t3573108

below is the link to Hybrid ROM for A2017U

https://androidfilehost.com/?fid=457095661767154458 by Michael Warner	After flash install No verity patch for the bootloader.

Cheers.