[OnePlus 7 Pro Questions & Answers] zomebody:
Hi everyone

I have the Oneplus 7 Pro GM1913

Im really strugling her. I feel like ive tried to approach this issue from all different angles. Ive tried to flash a stock rom from Fastboot, ive tried the "ULTIMATE UNBRICK GUIDE" and all things inbetween.

So a little backstory. I tried to flash Lineage on my phone, i succeded in that but i forgot about the GAPPS package so i tried to boot into TWRP again to flash a OpenGapps package but something happened and i cant seem to solve it.

I was hoping i could boot into EDL-mode and flash a stock rom from there but im not able to get into EDL. Ive installed the latest drivers and i do the procedure where i power the phone off and hold VOL UP + VOL DOWN and then plugging in the powercable which is connected to my computer via a USB 2.0 connection(and yes im using the original cable from OP). The phone shows up in Device Manager in Windows with the correct name and not as an unknown device as long as i hold the VOL UP + VOL DOWN. But as soon as i release the buttons the phone reboots into Fastboot.

The only protocol that is available is Fastboot, ADB isnt registering a device so im at a loss. Completely stuck after trying everything.

Please help.

PS: Im unsure of what someone that wants to help me needs in order to help me as much as they can so let me know if theres any logs i can give you and what not.

This was the output during my last fastboot flash of stock rom.

--------------------------------------------
Bootloader Version...:
Baseband Version.....:
Serial Number........: 402c03f4
--------------------------------------------
extracting android-info.txt (0 MB) to RAM...
android-info.txt syntax error: ﻿require product=msmnile
Setting current slot to 'b' OKAY [ 0.015s]
extracting boot.img (96 MB) to disk... took 0.407s
archive does not contain 'boot.sig'
Sending 'boot_b' (98304 KB) OKAY [ 3.007s]
Writing 'boot_b' OKAY [ 0.410s]
extracting dtbo.img (16 MB) to disk... took 0.099s
archive does not contain 'dtbo.sig'
Sending 'dtbo' (16384 KB) OKAY [ 0.514s]
Writing 'dtbo' OKAY [ 0.065s]
archive does not contain 'dt.img'
archive does not contain 'recovery.img'
extracting vbmeta.img (0 MB) to disk... took 0.000s
archive does not contain 'vbmeta.sig'
Sending 'vbmeta' (8 KB) OKAY [ 0.015s]
Writing 'vbmeta' OKAY [ 0.003s]
archive does not contain 'vbmeta_system.img'
archive does not contain 'vendor_boot.img'
archive does not contain 'super_empty.img'
archive does not contain 'boot_other.img'
extracting odm.img (100 MB) to disk... took 0.344s
archive does not contain 'odm.sig'
Sending 'odm' (102400 KB) OKAY [ 3.126s]
Writing 'odm' OKAY [ 0.401s]
archive does not contain 'product.img'
extracting system.img (3472 MB) to disk... took 23.384s
Invalid sparse file format at header magic
archive does not contain 'system.sig'
Sending sparse 'system_b' 1/5 (768202 KB) OKAY [ 23.454s]
Writing 'system_b' OKAY [ 0.003s]
Sending sparse 'system_b' 2/5 (771518 KB) OKAY [ 27.851s]
Writing 'system_b' OKAY [ 0.003s]
Sending sparse 'system_b' 3/5 (773698 KB) OKAY [ 28.631s]
Writing 'system_b' OKAY [ 0.003s]
Sending sparse 'system_b' 4/5 (769870 KB) OKAY [ 29.331s]
Writing 'system_b' OKAY [ 0.003s]
Sending sparse 'system_b' 5/5 (170520 KB) OKAY [ 13.009s]
Writing 'system_b' OKAY [ 0.003s]
archive does not contain 'system_ext.img'
archive does not contain 'system_other.img'
extracting vendor.img (1024 MB) to disk... took 6.608s
Invalid sparse file format at header magic
archive does not contain 'vendor.sig'
Sending sparse 'vendor' 1/2 (766091 KB) OKAY [ 23.461s]
Writing 'vendor' OKAY [ 0.003s]
Sending sparse 'vendor' 2/2 (207852 KB) OKAY [ 11.158s]
Writing 'vendor' OKAY [ 0.003s]
archive does not contain 'vendor_other.img'
Erasing 'userdata' OKAY [ 0.245s]
mke2fs 1.45.4 (23-Sep-2019)
Creating filesystem with 59463283 4k blocks and 14868480 inodes
Filesystem UUID: 51af292e-e7ad-4b0f-9053-9db9ebc06dce
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424, 20480000, 23887872

Allocating group tables: done
Writing inode tables: done
Creating journal (262144 blocks): done
Writing superblocks and filesystem accounting information: done

Sending 'userdata' (5080 KB) OKAY [ 0.153s]
Writing 'userdata' OKAY [ 0.004s]
Erasing 'metadata' OKAY [ 0.007s]
Erase successful, but not automatically formatting.
File system type raw not supported.
Rebooting OKAY [ 0.002s]
Finished. Total time: 216.824s