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I want to root my phone, install custom recovery and eventually a custom ROM. For this, I need to unlock the bootloader.

I have an Oppo A5 2020 CPH1931. It should go into bootloader when I press volume+ and power buttons together for 5 seconds after completely turning off the phone. But when I do this, it boots like normal. Tried all different combinations and durations. I am able to boot into recovery but not fastboot mode. I have turned on the "OEM unlocking" option in developer options.

I tried it through ADB, it says fastboot on the screen for half a second and then once again jumps back to normal booting. I also tried to already put the fastboot command "fastboot oem unlock". When it says I use another terminal to try to boot into fastboot with ADB. But this does not work (also tried this with "fastboot flashing unlock").

By the way, my devices only shows up with adb devices when I select transfer files upon connecting the USB cable. When I select just charge it doesn't even show.

There are tons of guides online on how to enter the bootloader of this device, so it must have been possible at some point. I considered trying to revert to an old STOCK ROM that still has fastboot. I contacted Oppo about this but they keep trying to confuse me and then just left the conversation.

Is there a way to go back to an old STOCK ROM that still supports fastboot mode?

EDIT: I tried using the EDL toolbox provider by Björn Kerler like Alecxs suggested, but it cannot find a loader for my device:

Qualcomm Sahara / Firehose Client V3.53 (c) B.Kerler 2018-2021.
main - Trying with no loader given ...
main - Waiting for the device
......
main - Hint:   Press and hold vol up+dwn, connect usb. For some, only use vol up.
main - Xiaomi: Press and hold vol dwn + pwr, in fastboot mode connect usb.
        Run "./fastpwn oem edl".
main - Other:  Run "adb reboot edl".

...............
...main - Device detected :)
main - Mode detected: sahara
Device is in EDL mode .. continuing.
sahara -




HWID:              0x0010a0e100510000 (MSM_ID:0x0010a0e1,OEM_ID:0x0051,MODEL_ID:0x0000)
CPU detected:      "nicobar"
PK_HASH:           0x6e91b529aad0307f1fc67310dab1ff821eb7aa02fa5620157a9d20e124f4e0b8
Serial:            0x31276e91


sahara
sahara - [LIB]: Couldn't find a loader for given hwid and pkhash (0010a0e100510000_6e91b529aad0307f_[FHPRG/ENPRG].bin) :(
Device is in an unknown sahara state, resetting
resp={'cmd': 1, 'len': 48, 'version': 2, 'version_min': 1, 'max_cmd_len': 1024, 'mode': 0, 'res1': 0, 'res2': 0, 'res3': 0, 'res4': 0, 'res5': 0, 'res6': 0, 'object_size': 48, 'raw_data': bytearray(b'\x01\x00\x00\x000\x00\x00\x00\x02\x00\x00\x00\x01\x00\x00\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00')}
Anteino
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  • device is not unlockable. adb unrelated – alecxs Oct 27 '21 at 11:36
  • I read something about doing this in EDL mode but I cannot find a lot of information about this. – Anteino Oct 27 '21 at 11:51
  • try old unlock method by modifying devinfo https://forum.xda-developers.com/showthread.php?t=4100897 – alecxs Oct 27 '21 at 12:34
  • I found a list of all firehose files. But how do I know which one belongs to my device? https://www.gadgetsdr.com/all-qualcomm-prog-emmc-firehose-programmer-file-download/ – Anteino Oct 27 '21 at 15:56
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    check specifications of device SoC is UFS or eMMC + qualcomm model + suffix OPPO – alecxs Oct 27 '21 at 15:57
  • I found the firehose for another device that has the same SoC but QFIL is giving me sahara failures. I tried disabling my antivirus, put windows in test mode, disabling integritychecks and enabling testsigning. But all to no avail. I think I might give up and buy a new decent device. – Anteino Oct 28 '21 at 01:31
  • first find test point, enter EDL mode, install Qualcomm HS-USB QDLoader 9008 Driver, enter EDL mode again and start sahara within first < 30 seconds - only then it may work. btw linux https://github.com/bkerler/edl is much easier to use – alecxs Oct 28 '21 at 07:16
  • I tried this and it cannot find a loader, also see edited post. I'm giving up. Going to the store this afternoon and probably buying me a Xiaomi Redmi Note 10 Pro ;) – Anteino Oct 28 '21 at 09:52
  • probably no loader exist (or not yet imported from https://github.com/bkerler/Loaders/tree/main/oppo) but you can always provide own loader (which you found previously) https://android.stackexchange.com/q/226838 – alecxs Oct 28 '21 at 10:08
  • This was an MBN file, not a BIN file like the EDL tool uses. I don't feel comfortable enough around this stuff to figure this out. I have a general grasp of what's going on but I have come to the point where I do not longer know what I'm doing. – Anteino Oct 28 '21 at 10:26
  • file name doesn't matter. edl.py provides module for oem unlock too. However chances to unlock are low to zero, be wise :) – alecxs Oct 28 '21 at 10:30
  • Yea that seems like an awful lot of trouble for a low chance of succes – Anteino Oct 28 '21 at 10:38

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