[Realme C3 Questions & Answers] LegendTDD:
The 0x992566 error is because when using "SP flash tool" and using the "Format all" option it causes us to erase all partitions on the device and if you thought that you bricked the phone and it won't react anymore, relax, because

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it's an easy fix for that you have to install the "Oppo_Custom" partition but keep in mind something:

If you got to have the "NvRAM" and "NVdata" partition you can recover the IMEI but if not then this tutorial will only fix the system but will not recover the IMEI (it is better that after restoring the device you go to a support center to have them Installed).

STEP 1: download the file ZIP

Download Not Complete Solution.zip

drive.google.com

You must download the ZIP file, it contains all the files to be able to restore the phone (WARNING: DO NOT ATTEMPT TO DOWNLOAD FILES FROM OTHER SITES, YOU MAY END UP DAMAGING THE DEVICE)

Step 2: you must unzip the file

Step 3: open the "ByPASS" folder and open the "Lib USB" installer and install it.

Step 4: open the executable "mtk_bypass_rev4" and when it is open press the "BYPASS" button.

Step 5: now turn off the device (wait for the countdown to end) and hold down the volume + and volume - buttons while the bypass waits for it to recognize the device i.e. by holding them down you connect it to the pc, otherwise it will not go into "BROM" mode (but if it fails to connect you should open the "Lib_USB" application and when you apply these steps you should hit the "Mediatek USB Port" option and hit "install device").

Step 6: after bypassing the device you should open the "SP Flash Tool" folder.

Step 7: now in the "Download Agent" box select the "Choose" option and select the file "DA_6765_6785_6768_6873_6885_6853.bin".

Step 8: now in the "Scatter -Loading File" box select "Format all + Download scatter".

PLEASE NOTE: the phone must be in BROM mode and connected to the PC and make sure that the "Oppo custom" partition is selected and you have not moved it to another place.

Final step: you must change the "Download only" option to "Format all downloads" and press the download button.

If everything went well in the loading bar will start to load the system to the phone and you should wait 10 minutes or more (depends on the speed of the pc) after the process is finished a window with an arrow will appear.

Disconnect the device and turn it on with volume + and the power button.

NVRAM AND NVDATA

EYE IF YOU DON'T HAVE A COPY OF YOUR NVDATA AND NVRAM OF YOUR DEVICE SKIP THIS PART AND GO TO A SERVICE CENTER TO RESTORE YOUR IMEI.

If you have a backup of these files, you must open in the unzipped file the folder "NVRAM Scatter" and open SP Flash Tool.

Step 1: in the "Scatter loading file" part select the "Nvdata Nvram Scatter" file (it is located in the "nvram scatter" folder).

Step 2: after selecting it, you should scroll down and select the Nvram and Nvdata partition and then select its partition file.

Step 3: select the "preloader" partition and this will open a window and in it you should go to the "RMX2020 Stock ROM" folder and select the "preloader_oppo6769" file.

Step 4: now open the "MTK bypass" and you should put the phone in "BROM" mode (remember to turn off the phone and hold volume+ and volume- and connect the phone to the pc without releasing the buttons i.e. holding down you connect it to the pc, otherwise it will not go into "BROM" mode).