[OnePlus 5T  ROMs, Kernels, Recoveries, & Other Dev] PeterGuru:
Detailed Instructions on how to Flash Liquid Remix from OxygenOS

Okay, for those of you who are having issues flashing this ROM, or any ROM for that matter, below are very specific instructions. I've prepared this because I, too, had issues with other ROMs, and the following instructions saved me.

There's often a problem if you're moving from a Nougat ROM to an Oreo ROM, especially if you're coming from an encrypted ROM and want to flash a decrypted ROM. OxygenOS is encrypted by default, while many other custom ROMs are NOT encrypted. This is often the reason why you'll run into boot loop issues.

Again, if you're coming from OxygenOS and want to flash Liquid Remix, follow these instructions EXACTLY and you should be okay. I'm using official TWRP v3.2.1-0; although, Blu_Spark works just as well.

CAUTION: THIS WILL WIPE ABSOLUTELY EVERYTHING ON YOUR DEVICE. I REPEAT, THIS WILL WIPE ABSOLUTELY EVERYTHING ON YOUR DEVICE. SAVE ANY IMPORTANT DATA TO YOUR PC.

So, here we go …

1)	Reboot into TWRP Recovery

2)	Click on Wipe

3)	Click on ADVANCED WIPE

4)	Check the boxes for Dalvik / ART Cache, Cache, System, Data AND Internal Storage

5)	Swipe to Wipe

6)	Go back and repeat Steps 4 & 5

7)	Go back to the Factory Reset screen and Swipe to Factory Reset

8)	Go back and repeat Step 7

9)	Go back and click on FORMAT DATA

10)	Type yes and click on the check mark

11)	Go back and do it again. Yes, again. Call me paranoid, but performing the wiping process twice makes sure that EVERYTHING gets wiped.

12)	Go back to TWRP Home screen and leave your device alone for a moment

13)	Go to your PC and open a Command Prompt with Administrator Privileges

14)	Change the directory to the one with your ADB Fastboot program files. For me, this is c:\adb

15)	To change directory, type: cd c:\adb (cd = change directory, and c:\adb = the directory of your ADB Fastboot files.

16)	You're now going to push the needed files from your PC to device; however, before you start, you MUST put a copy of the needed files into the same directory as your ADB Fastboot files. To make the push process easier, rename these files to rom, gapps, magisk (for root), and verity, where rom is the Liquid Remix ROM, gapps are the latest GAPPS for Oreo 8.0, magisk is, well, Magisk, and verity is your DM-Verity file.

17)	Here are the commands to "push" the files from PC to device. Do them one at a time. The character "^" represents a space

18)	Type: adb^push^rom.zip^/sdcard (and hit return)

19)	Type: adb^push^gapps.zip^/sdcard (and hit return)

20)	Type: adb^push^magisk.zip^/sdcard (and hit return)

21)	Type: adb^push^verity.zip^/sdcard (and hit return)

22)	Go back to your device and click on Install

23)	Navigate to directory sdcard and click on it

24)	You should now see the 4 files pushed in Steps 18 through 21

25)	Flash them in the following order: rom, gapps, magisk, verity

26)	When everything is done, reboot device

27)	The reboot process could take a few minutes, but it should not take longer than 5

28)	If it takes longer than 5 minutes, start the entire process all over again

29)	You should now find yourself at the initial set-up screen

30)	DONE!

31)	ENJOY!

32)	If you cannot boot, or things go wrong, proceed to Step 33 below

33)	Steps 1 through 12 MIGHT delete the custom recovery from your device and replace it with stock recovery. No problem. Simply re-flash your custom recovery as follows:

34)	Reboot into Bootloader (Fastboot Mode) by holding down the POWER key for about 8 seconds until your device powers off

35)	While holding down the POWER key, simultaneously hold down the VOLUME UP key to enter the Bootloader

36)	Before you continue, place a copy of your custom recovery image file into the same directory as your ADB Fastboot files

37)	Rename this file to recovery

38)	Go back to your Command Prompt

39)	Type: fastboot flash recovery recovery.img

40)	Type: fastboot reboot but DO NOT yet hit the enter key

41)	Hold down the POWER and VOLUME DOWN keys simultaneously

42)	While holding down those 2 keys, hit the enter key on your PC, all the while continuing to hold down the 2 keys

43)	You should now reboot back into your custom recovery

44)	Repeat Steps 1 through 31.

I hope the above helps for those of you having problems.

Regards,

Peter