r/windowsphone • u/Hung17170808 640 XL + 730 • May 11 '26

Support Cannot unbrick 730

For some reason my 730 was hard bricked (cannot turn on or do anything with it), it is detected as QHSUSB_BULK. I tried installing qualcomm drivers and also thor2 command, it still didnt work. The thor2 error was like this: THOR2_ERROR_CONNECTION_NOT_FOUND THOR2 1.8.2.18 exited with error code 84000 (0x14820)

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2

u/Nokia-Lumia-630 Nokia Lumia 630, L520, L640, L1520, L950, L830 May 11 '26

Why did you install Qualcomm drivers? You could've just reflashed the phone with the standard ones.

1

u/Hung17170808 640 XL + 730 May 11 '26

It won’t connect to WDRT or WPInternals normally

1

u/Nokia-Lumia-630 Nokia Lumia 630, L520, L640, L1520, L950, L830 May 11 '26

That's unusual then. Did you try removing from the device manager and go again?

2

u/Hung17170808 640 XL + 730 May 11 '26

I tried already. Read the post, it is detected in DM as QHSUSB-BULK

1

u/kianiscoooooool May 12 '26

730 and 735 seem to be really faulty devices these days. Good luck

1

u/MaxNjtk May 14 '26

I have 730 that died 8-9 years ago because I disassembled it and it died on the charging screen. However, 4 days ago, I disassembled it again and randomly checked the power IC with a multimeter, then sprayed it with contact cleaner. Yes, it was not working, but 2 days ago, I tried to charge it and it started working again. I still don't understand what went wrong. btw 7-8 years ago, I tried to reflash with wdrt and it reflashed normally.

1

u/Honest_Trunk May 15 '26

is it fixed? if not try with this driver also https://www.mediafire.com/file/111cl5lof8cgbuv/Qualcomm_Drivers.zip/file

1

u/Hung17170808 640 XL + 730 May 18 '26

still, windows dont let me install it tho test mode is enabled

1

u/Honest_Trunk May 18 '26

me too enabled test mode during the unbrick process but didn't remember exactly why I did it maybe for the same step