No OS Found Error in TWRP: How to Fix

It seems that the No OS Found Error in TWRP recovery becomes one of the common issues among Android device users while flashing the firmware zip file via TWRP....

Subodh Gupta

Last updated on January 30, 2026

Subodh Gupta

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Subodh loves to write content whether it may be tech-related or other. After writing on tech blog for a year, he becomes passionate about it. He loves playing games and listening to music. Apart from blogging, he is addictive to the gaming PC builds and smartphone leaks.

It seems that the No OS Found Error in TWRP recovery becomes one of the common issues among Android device users while flashing the firmware zip file via TWRP. If you’re getting into the custom development segment or trying to flash external stock firmware, you’ll require a custom recovery. Well, TWRP (TeamWin Recovery Project) recovery is one of them, and it should work without any help from other programs such as Magisk.

1. Change Slots (For A/B Devices)

If your device does have a dual partition option then make sure that you’re booting to the active slot rather than booting to the inactive slot. The inactive slot doesn’t have the system.img file installed. In that scenario, you’ll just need to switch to the active slot and then check for the results. To do so:

Go to the Reboot option in TWRP. It’ll now list out the current slot.
- If it’s an A slot, tap on the Slot B button or select B if the current slot is A.
Now, you’ll get the No OS error message in TWRP once again.
Just skip it and perform a right swipe to proceed further.
Then your device will boot to the other slot > Go to Reboot and select System.
If your device gets booted to the OS then all is good.

Finally, check for the No OS found error in the TWRP Recovery.

4. Use ADB Sideload

Sometimes the data partition may get encrypted and the chances are high that you wouldn’t be able to identify any file on your device which can conflict with such issues. It’s better to use ADB sideload method by following the steps below to install the Custom ROM on Android.

Download and extract the Android SDK Platform Tools on your PC.
Transfer your ROM file to the platform-tools folder where it’s installed.
Go to Advanced in TWRP > Select ADB Sideload.
Now, perform a right swipe to start the sideload process.
You’ll have to connect your device to the PC via a USB cable.
Next, go to the platform-tools folder address bar > Type cmd and hit Enter to open Command Prompt.
Then just type in the below command and hit Enter to flash the file via sideloading: [Replace file.zip with the actual file name and add .zip at last]

adb sideload file.zip

Now, go to the Reboot section in TWRP > Select System.
If your device is able to boot to the system successfully that means the No OS Found Error in TWRP issue has been fixed.

5. Flash Stock Firmware

If none of the methods worked for you then make sure to flash the stock firmware via Fastboot Commands or device-specific tools such as SP Flash Tool, Mi Flash Tool, Android Flash Tool, etc. To do so:

Go to Reboot in TWRP > Select Bootloader.
You’ll again get the No OS error message > Skip it and perform a right swipe to confirm.
Your device will now boot to the Fastboot Mode.
Now, you’ll have to flash Stock Firmware via Fastboot Commands according to your OEM or model number.
Have some patience and perform all the steps correctly to boot your device into the newly installed OS.

That’s it, guys. We assume this guide was helpful to you. For further queries, you can comment below.

No OS Found Error in TWRP: How to Fix