Oppo F11 Pro, need help unlocking bootloader and flashing rom

[Neon111]

Hello!
I need to downgrade Android 10 to Android 9 on my Oppo F11 Pro. I've flashed many roms till now on other devices. This one is a bit *cough*
I have the .ozip file of the Android 9 rom, need to flash.
Default recovery mode of ColorOS doesnt work ofc, doesnt support downgrading.

After converting .ozip to .zip and extracting the files, SP Flash Tool or such tools arent able to get the files somehow They dont load it up, even not the scatter files.

So I think I should first unlock the bootloader, which I've been trying to today.

Doing the "adb devices" doesnt list my device, guess I need the drivers.
Downloaded drivers but they are in .inf format, which Ive been unable to install (with my "search the internet and do it" ways.
"The inf file you selected does not support this method of installation". And thru administrator cmd, its Installation failed.

Im so confused with those drivers Idk which ones to install.
One driver I've pasted on hastebin as.. hastebin[dot]com/abopesexej.shell
Couls someone pls help me out? Im hitting the wall atm

 

[Deleted member 1890170]

Doing the "adb devices" doesnt list my device, guess I need the drivers.
Downloaded drivers but they are in .inf format, which Ive been unable to install (with my "search the internet and do it" ways.
"The inf file you selected does not support this method of installation". And thru administrator cmd, its Installation failed.

Im so confused with those drivers Idk which ones to install.
One driver I've pasted on hastebin as.. hastebin[dot]com/abopesexej.shell
Couls someone pls help me out? Im hitting the wall atm

Don't mix up USB-driver and ADB-driver and/or Fastboot-driver: totally different drivers.
A USB-driver is a file that allows an USB hardware device to communicate with the operating system of a computer. This driver is implemented in all operating systems by default.
ADB-driver and/or Fastboot-driver is a “bridge” for Android developers / hackers to work out bugs in their Android applications and/or modify existing Android OS. This is done by connecting an Android device that runs the software through a PC, and feeding appropriate commands in its terminal.

Don't use any ADB-driver and/or Fastboot-driver as they are hundreds of times published on the WEB - and even here on XDA. Only make use of those drivers officially offered by your device's OEM/Carrier.

 

[Neon111]

Comment withdrawn by author.

 

[Neon111]

(When "adb devices" shows the device serial)
When i try to do "adb reboot bootloader",
The phone reboots and says
"The serial is not matched
fastboot_unlock_verify fail"

What should I do? :u

 

[Neon111]

And not being able to use fastboot.. I cant find related drivers on the internet for that purpose.. I downloaded and installed what I could (fastboot commands not working.. shows <waiting for device> )

 

[Deleted member 1890170]

(When "adb devices" shows the device serial)
When i try to do "adb reboot bootloader",
The phone reboots and says
"The serial is not matched
fastboot_unlock_verify fail"

What should I do? :u

Generally speaking, the serial number as reported by ADB will be different to Fastboot as determined by:

Manufacturer
Make and model of device in question
Android version

Fastboot, on the other hand, since there's no ADB loaded, instead, uses a rudimentary USB protocol tied in with Android's boot-loader, the serial number will be different.

EDIT:

And not being able to use fastboot.. I cant find related drivers on the internet for that purpose.. I downloaded and installed what I could (fastboot commands not working.. shows <waiting for device> )

Your Oppo F11 Pro is based on Mediatek chipset. IMO you instead of Fastboot driver have to make use of Oppo F11 Pro Mediatek driver - a specialized version of general Fastboot driver - what is compatible with SP Flash Tool, MTK Flash Tool, SP MDT Tool and SN Write Tool.
DL: https://gsmusbdriver.com/oppo-f11-pro

 

[Neon111]

Your Oppo F11 Pro is based on Mediatek chipset. IMO you instead of Fastboot driver have to make use of Oppo F11 Pro Mediatek driver - a specialized version of general Fastboot driver - what is compatible with SP Flash Tool, MTK Flash Tool, SP MDT Tool and SN Write Tool.
DL: https://gsmusbdriver.com/oppo-f11-pro

But I do not have flash files related to the listed programs..
Everywhere I could find only an .ozip file, which I turned into a .zip from a program I found on here. The zip when extracted gave me all the .img files and scatter.txt, but the scatter.txt doesnt load up in SP Flash Tool and the like.

 

[subham619]

But I do not have flash files related to the listed programs..
Everywhere I could find only an .ozip file, which I turned into a .zip from a program I found on here. The zip when extracted gave me all the .img files and scatter.txt, but the scatter.txt doesnt load up in SP Flash Tool and the like.

Were you able to unlock your bootloader? I found various tutorials of extracting boot image from the ozip files. But Veterans are saying oppo doesn't let people unlock bootloader.