First, you can try the official method to install the OTA stock ROM update via Realme device recovery.
Download the Qualcomm Flash image loader tool and USB Drivers on your PC. Follow the below link to install the firmware using QFIL tool
Steps to Flash Stock Firmware Using QFil Flash Tool
Here are the instructions you need to follow in order to install Stock ROM on the Realme RMX2192 :
- First of all, do all the PREREQUISITE STEPS and Now Open the Extracted QPST Folder
- You will find two files with the name: Qualcomm_USB_Drivers_For_Windows.rar and QPST.WIN.2.7 Installer-00429.zip

- Open the QPST Win folder and Install the QPST.exe file on your PC/Laptop

- After Installation, Go to the Installed Location in the C Drive
- Open the QPST Configuration

- Now in the QPST Configuration, Click on Add new port -> Select the com port of your device -> and close it

- Now Open the EMMC Software Downloader in the same folder located all the QPST Files

- In EMMC Software Downloader, Check program boot loaders -> Browse for the device com port

- Now Click Load XML Def and browse for rawprogram0.xml in folder ROM in EMMC Software Downloader (If you didn’t extract please extract the ROM and then browse the file rawprogram0.xml)

- Now tap on Load Patch def and browse for patch0.xml in folder ROM

- Check the search path 2 and browse for the folder ROM

- Now click download, wait for the download to finish (it never finish but it also detects for a new driver, and that’s important) and it will search for the new hardware found, install the driver
- That’s it! Once your installation is done! Reboot the phone! Congrats, you successfully installed Stock ROM on Realme RMX2192.
Download MSM Download Tool and Qualcomm USB Drivers on your PC. Follow the below link to install the firmware using the MSM Download tool
Flash Oppo Firmware via MSM download tool
That’s it, guys. We hope that you’ve installed the Stock Firmware on your Realme RMX2192 device successfully. Feel free to ask in the comments below for any queries.