[OnePlus 6T  Questions & Answers] xnutzii:
Hello everyone, I have bricked my OnePlus 6T...well, actually it wasn't me who is the reason this happened. :/ Open Beta 3 user.

On Thursday, I was using my phone like I normally would, I was sending a screenshot to a friend which I cut down, and after I cut the picture down, I was writing a text to support the picture, now here is what the big issue comes in. The phone was freezing - I was like, ''alright I am on a beta afterall'', and this wasn't the first time this freezing happened. Suddenly, the phone just shut itself down and went black. After a few seconds, it boot up, but while doing so, it went into Qualcomm Crash Dump Mode, which I knew I've seen before, but not on my ''old'' 5T, which had - and still has the Open beta installed on it, for well over a year now.

This was a first time thing, I have never seen this mode on my phone before and i was panicking a bit and immediately went up to my laptop. I googled a bit, and I saw that this issue isn't a first time issue, it happened before on the OnePlus 6's Open beta firmware. And I was somewhat relieved, since I thought I may be able to fix this easily without loosing any data. Wrong thought.

After this, I tried reflashing the OS in fastboot, i downloaded fastboot ROM's and tried flashing them - one after another, none of them worked.

Then I tried to ask some friends at the OnePlus forum, since some of them have more knowledge than me, a lot more actually. They tried giving me solutions without losing any data, no luck. Then I was like ''alright, I'm f**ked, I need to give up on my data''. And since all of this happened suddenly without me having a chance to predict, I had no chance to backup any important data. Then I tried the msmdownloadtool, which firstly was a mistake, as I (as stupid as I am) used the OnePlus 6 msmdownloadtool, then i realized that I was using the wrong tool, and I downloaded the OP6T msmdownloadtool, too. After the download finished, I ran the tool with my 6T plugged in, it went through in about 300 seconds and my 6T was not booting up. Sometimes, it came to the boot animation and just crashed while booting.

Friday came and I tried the same thing over and over, no luck. I was busy doing other things, so I had not much time doing this all day.

Saturday was in and I tried the same stuff, but this time, I downloaded the msmdownloadtool with OOS 9.0.5 instead of 9.0.11, which made a very good first impression, the phone was booting up! But - I couldn't do anything and it froze on me and crashed. It was booting up, but...the system was unusable, I could drag the statusbar down and tap onto the navbar, but thats all I could do before it froze.

After this, the phone rebooted and went into Qualcomm Crashdump Mode, again! But this time, there was the usual text you get while the phone is in this mode, which was NOT there before. ''Normally'', the phone went into that mode with only the Qualcomm Crash Dump Mode showing up.

I tried everything i could, but no luck. The bootloader is locked again, so I can't flash anything over fastboot, recovery has been changed with the 6/6T anyway, so no OS flashing possible with that either, I am clueless right now and i would like you guys to help me out before having to send the phone back.

And as I could no see a thread regarding this particular issue, I was sure I could open up a new one.

If there are any language mistakes or whatever, bear with me, English is not my primary language. :)

Oh, now I kind of forgot to edit this - My phone is back working again after RMA.