this post was submitted on 09 Jun 2026
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Linux Phones

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The used OnePlus 6 I bought is stuck on a black screen, detected as "Qualcomm CDMA Technologies MSM QUSB_BULK_CID:0402_SN:B48453B9" (sopuli.xyz)
submitted 2 days ago* (last edited 2 days ago) by sbeak@sopuli.xyz to c/linuxphones@lemmy.ca
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Holding down the power button, the power button + volume up, and the power button + both volume buttons does not do anything. What does "Qualcomm CDMA Technologies MSM QUSB_BULK_CID:0402_SN:B48453B9" mean?

I followed the guide using a prebuilt postmarketOS image (v25.12 w/ Phosh). I ran fastboot erase dtbo, fastboot flash boot (.img file), fastboot flash userdata (another .img file), and finally fastboot reboot. I saw a few Tux penguins in the corner and saw the postmarketOS logo. Then, the display turned off. After that, I rebooted in fastboot mode and retried the fastboot flash step and did fastboot reboot. Now my device seems to be unresponsive and appears as "Qualcomm CDMA Technologies MSM QUSB_BULK_CID:0402_SN:B48453B9" (in Android, it was seen as "OnePlus 6", while in fastboot mode, it was seen as "Google Android device")

Has anyone ran into this issue and know how to fix this?

edit: I did unlock the bootloader using "fastboot oem unlock" before flashing anything

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[–] pipes@sh.itjust.works 2 points 2 days ago (2 children)

I think you need the MSM Download Tool to reflash your phone to stock and start over

[–] g5pw@feddit.it 1 points 1 day ago* (last edited 1 day ago)

There’s an unofficial reimplementation of QC firehose/sahara, it works correctly on my OnePlus 6T.

[–] sbeak@sopuli.xyz 1 points 2 days ago (1 children)

That seems to be Windows exclusive, and Wine doesn't work with it

[–] hexagonwin@lemmy.today 2 points 2 days ago (1 children)

if you need to use any of qualcomm tools, you should install win7 or 10 in a vm. these are mostly leaked internal tools and there's usually no foss equivalent sadly

[–] sbeak@sopuli.xyz 1 points 1 day ago

Ok I will try to set that up later