[OnePlus 5 ROMs, Kernels, Recoveries, & Other Devel] oops_mr_gumby:
Desperately(!) need some help. Some time ago I modified /vendor/etc/mixer_paths_tasha.xml to set the RX1/RX2 mix digital values for "headphones" to 88. I have done this many times before (previously only going up to 84 though, and in the past using a Magisk module I made to do it for me - but I haven't been using Magisk for a little while now) and I've been running with those changes for weeks on the March 17 build, without issue. Recently I've been noticing some distortion playing music though and I decided to try dropping those values down to 85. I used the built-in terminal with the official addon-su to remount,rw /vendor, and then nano to edit mixer_paths_tasha again, and then I rebooted using the power button without doing a remount,ro or anything. Now every time I boot it freezes almost immediately after the Lineage logo starts to appear - I either get the arc by itself and then it freezes and reboots, or I get the arc and it freezes right when the first circle appears, and reboots.

I just got home and am now doing an "adb pull /sdcard/" before trying anything else, but earlier today I tried a bunch of wipes and reflashes of that same build from out of the /data/lineage_updates/ folder. TWRP boots and runs seemingly without issue (though I have had notices on a few boots of TWRP about a hidden .recovery (I think that was it) file in /Cache that was read-only).

Along with trying the standard wipe in TWRP, I have used the advanced wipe to wipe everything but /sdcard and tried to flash the build I was on again, and I've tried many variations of wiping some/all partitions and trying to flash the build .zip, or flashing my last good backup from before I first installed the March 17 build, and combinations of same. I also tried re-flashing the 9.0.4 firmware to no avail. It always freezes on the Lineage logo and reboots.

Before starting to pull /sdcard/ just now, I tried booting while usb-connected to my desktop and running "adb logcat" but it just sits on "waiting for device". I guess my plan now is to do total wipe, this time including /sdcard/, once I finish backing that up, and try one more time to flash the build I was on (or the current one now that I'm home and can download it), and failing that to try restoring a stock setup with the current oxygenos before trying to Lineage back on there again.

Is there anything else I can do? Is there any way I can get some boot logs to see what's actually happening when it freezes? I desperately need to get this thing working again, please help!

edit: did complete wipe, dalvik/art, cache, system, data, internal storage. Then formatted /data, flashed April 7 build - still locks up on Lineage logo.

edit: wiped everything, formatted data, flashed OOS 9.0.4 from oneplus.com - IT BOOTS. I let it go to the welcome screen, then:

-rebooted to (now stock 1+) recovery

-rebooted to fastboot

-flashed latest codeworkx twrp 20190311

-rebooted to twrp

-wiped everything again, formatted data again

-pushed april 7 lineage build, flashed in twrp

...STILL locking on Lineage logo and bootlooping

edit: wiped everything and flashed OOS 9.0.4 again (went through initial setup this time), rebooted to recovery, then fastboot - bootloader version and baseband version are not listed, there's a dash next to the label for each and then nothing on the other side of it.