Need help installing custom rom - OnePlus 7 Pro Questions & Answers

Hi all,
I'm really struggling to get my head around flashing custom rom to the OnePlus 7 Pro. I have the phone for years and love it but just now trying to flash a custom rom.
I have unlocked the bootloader and flashed TWRP. When I download the Pixel Experience Rom and flash that it says it's flashing to slot A (inactive) and then after reboot I'm still on old rom.
Can anyone give me a real idiots guide to flashing a rom? I'm getting old and my brain is slow.
Thanks

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Urgent help - Is possible to do this?

Since my AT&T ICS 4.04(final update) Atrix 2 won't pass beyond the M logo (have been flashed like ten times), I need someones help.
I can't downgrade to GB because would brick the phone forever or upgrade to a newer version. Or flash a custom ROM because the phone is not rooted and doesn't have any custom recovery tool installed.
So, I was thinking, maybe if I could flash an already rooted system and a custom recovery using RSDLite, could boot into the custom recovery, install a custom ROM and see if I can fix my phone.
Or maybe flash(RSDLite) a backup(or only the files need for this purpose) made by any user of the forum.
Is that possible? Please help.
norkitt said:
Since my AT&T ICS 4.04(final update) Atrix 2 won't pass beyond the M logo (have been flashed like ten times), I need someones help.
I can't downgrade to GB because would brick the phone forever or upgrade to a newer version. Or flash a custom ROM because the phone is not rooted and doesn't have any custom recovery tool installed.
So, I was thinking, maybe if I could flash an already rooted system and a custom recovery using RSDLite, could boot into the custom recovery, install a custom ROM and see if I can fix my phone.
Or maybe flash(RSDLite) a backup(or only the files need for this purpose) made by any user of the forum.
Is that possible? Please help.
Click to expand...
Click to collapse
It would be better to ask all the questions in one thread itself, rather than making new ones each time for a newer question.
RSDLite can't flash files which aren't signed by Motorola, hence no pre-rooted or custom recovery installed ROM can be flashed this way, since they won't have Motorola signatures.

Problems Installing Custom Rom

hey can you guys help me with installing a custom rom on my one. im fairly new at installing roms on HTC. very familiar with samsungs but anyways. my htc is rooted and s-off, i'm currently on 5.0.1 4.17.605.5.....ive tried to install a custom rom but after the installation is done it keeps going into a recovery loop....i used both twrp and cwm for recovery but both end up with a recovery loop...any ideas why this is occuring....also the rom i tried to install was skydragon and lolligpe
try this
lj1242 said:
hey can you guys help me with installing a custom rom on my one. im fairly new at installing roms on HTC. very familiar with samsungs but anyways. my htc is rooted and s-off, i'm currently on 5.0.1 4.17.605.5.....ive tried to install a custom rom but after the installation is done it keeps going into a recovery loop....i used both twrp and cwm for recovery but both end up with a recovery loop...any ideas why this is occuring....also the rom i tried to install was skydragon and lolligpe
Click to expand...
Click to collapse
You could try extracting the boot.img from you custom rom, placing it in your adb folder, then flash the boot image all by itself with TWRP. That has pulled me out of bootloops....

need advice with flashing rom

Hey, so I installed newest oxygenOS 2.1.4 for oneplus one which cames with its own recovery...I want to go back to cm12.1, don't have backup so I want clean and fresh installation. Now I am not sure what is the best method to do it without problems or bricking my phone, alot of people are bricking their phones when reverting back to cm12.1.
I want to know few things and can't find it on web, can I flash TWRP recovery without problems? Saw posts where people get into bootloops when doing this. Should I download fastboot zips and install it via adb or flashable zips and install it with recovery. If I choose flashable zip than I need to download kernel and modem also right? Or if I choose fastboot zips and don't install TWRP, would there be any problems because right now I see oneplus logo when I am in fastboot so I assume its their version and people said its buggy and flashing ROM with it is like playing russian roulette.
This is so confusing to me and I can't find those answers in flashing guides.
I used this guide http://forum.xda-developers.com/oneplus-one/general/guide-return-opo-to-100-stock-t2826541 to go back to 12.1 than installed custom ROM

XT1225 - Stock ROM works fine, custom ROMs don´t load

I was using the RR ROM (don´t remember wich version) and someday the screen starts to froze often, I manage to go to TWRP and did the wipes and re-flash the ROM, but it got stucked in RR logo, until reboot to recovery. I tried to flash different ROM's, but no different results. So I flash the Stock ROM, the TWRP version that I found here in the forum, and it worked!! But then again I tried to install a custom ROM and it not load, I don't know what problem it could be. So if someone here have any ideas I really appreciate the help!
Hoy. Did you tried to flash a stock rom with RSD lite? I always fully re-flash after a custom ROM. But imo custom roms don't sit well with Moto Maxx, they drain battery super fast. Back when mine was new i could get like 4 days of battery in the OEM rom, just debloated. With 6.0.1 i get at least one day, but with a custom rom i'm lucky if i get near that now.

need help on harpia

I rooted my device harpia and flash linage OS
after some days I found some problems with this OS so I flashed stock rom
since I do this I can't even flash twrp on my device
is there any way to flash a custom rom in this device ?
thanks in advance!!
If device's bootloader is got successfully unlocked then you at any time can flash a Custom ROM - preferably by Fastboot.

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