How to Install Custom ROM on Any Android (No PC, No TWRP, Unlocked Bootloader) | Android 16 Tutorial

https://youtu.be/iJgvcT8mALo?si=Fk6y745MwwGwSJ-p

Install Custom ROM on Any Android Phone in 2025 — even if your device has no official ROM on XDA. In this video, I’ll show you how I turned an old Moto phone stuck on Android 12 into a device running Android 16 with all the new features, using a GSI ROM and without using a PC.

This guide works on all Android phones that support bootloader unlocking, including OnePlus, Samsung, Nothing, Motorola, Realme, Xiaomi, Pixel and more — as long as the device supports Project Treble.

If your phone doesn’t have a dedicated custom ROM available, you can still install a GSI ROM like Evolution X GSI, LineageOS GSI, and many others. This video shows the full process step by step.

What You’ll Learn
How to install Android 16 or Android 15 GSI on any supported phone
Install custom ROM without a PC
Use one phone to flash another with Bugjaeger
Fix common errors like “not enough space to resize partition”
Flash system.img properly
When to use VBMeta
How to check Project Treble support

Requirements and safety tips before flashing
Requirements
Bootloader unlocked (mandatory)
Device released after Android 10 with Project Treble
Treble Info app
Bugjaeger app

Another Android phone with USB-C to USB-C cable
GSI ROM of your choice
Downloads / Tools
Treble Info (Play Store)
Bugjaeger (Play Store)
GSI ROMs (GitHub)
Evolution X GSI
Lineage OS GSI

Important Warning
Always back up your device before flashing. Flashing GSIs is not risk-free.
Run fastboot getvar all in fastboot mode and save all device information.
Check a model-specific unbrick guide for your phone before proceeding.

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0:00 · Today I've got a Moto phone that's officially stuck on Android 12. Yeah, it's an old device, but guess what? Now it's running Android 16. It has all the features of Android 16 like Circle to search, the new user interface, better performance, and so much more. And here's the best part. I installed this without using a PC at all. Now, you might be wondering how you can install this on your device. This video is for anyone who wants to install a custom ROM but can't find one for their specific device on XDA or anywhere else. So, what's the solution?

0:31 · We can install a gsi ROM on phone. It's also a custom ROM and many ROMs actually provide gsis. For example, we can install Evolution XGSI, Lineage OS GSI, and many more options.

0:47 · So, if there's no custom ROM available for your device either, keep watching this video. But if you can find an official custom ROM for your device on XDA, please don't install GSI. Go ahead and install the custom ROM instead. Now, let's see how you can install this on your device, too. The only requirement to install this is an unlocked bootloader. If your device bootloader isn't unlocked yet, you can check out my videos on unlocking bootloader. I've created videos covering all the major brands. In this video, I'm using a Moto phone, but this guide will work on all devices released after Android 10.

1:20 · That's when Google introduced Project Treble in Android 11. So, first thing first, you need to download an app called Treble Info. After installing and opening this app, if it says that Project Treble is supported, congratulations. Your device is supported and you can install a GSI ROM on it. Now, on this app's homepage, just click on the browse images button. It'll take you to a GitHub repository where you can find multiple GSI ROMs for Android 16, Android 15, and more. You'll also find Evolution X, Lineage OS, and plenty of other gsi ROMs.

1:53 · So, go ahead and download according to your preference. After downloading your preferred GSI, we need to flash this onto your device without a PC. To do this, we'll use another Android phone as a PC. You can use any phone for this.

2:07 · All phones support this feature, so you'll need to transfer the downloaded GSI ROM to your secondary phone. Since these GSIS are archive files, you'll have to extract it first.

2:22 · As you can see here, I've extracted the gsi archive file and it revealed three files, but we're only going to use system image file. Now, to flash this system image, we need to download an app from the Play Store called Bug Jagger.

2:36 · After downloading this app, open it up and head over to the fast boot tab.

2:47 · Then pick up your primary phone, go to developer options, and enable USB debugging.

3:08 · This is required to connect the devices.

3:12 · Once that's done, grab any type-C to type C cable and connect both devices together.

3:21 · After connecting both devices with the USB cable, check on your primary phone to make sure it's taking charge from the secondary phone. This is important. If your primary phone is charging the phone that has Bug installed, then remove and reinsert the cable. As you can see, my phones are now connected and Bug is showing the connected device. So, go ahead and allow the permission to work with this in the Bug app and also grant USB permissions on your primary phone.

3:54 · Now, click on the reboot fast boot mode button in the Bug app. This will reboot your device into fast boot mode.

4:01 · If that doesn't work and your phone just powers on instead of going into fast boot, try the reboot bootloader option instead. Once your device has booted into fast boot or bootloader mode, click on this floating shell button in the Bug Jagger app and it'll launch a terminal interface. Yeah, this app does show ads, but it's a free and useful app, so it deserves an ad view.

4:23 · Now, in this text field, while your phones are connected, type fast boot flash system.

4:34 · Then click on this attachment button and select the extracted system image file.

4:40 · Once you've selected the file, this app will import it.

4:46 · And once it's imported, press the arrow button to begin the flashing process.

4:51 · You might run into this error like I did saying there's not enough space to resize your partition. Don't worry though, we've got a fix for this. Type this command fast bootdelete logical partition product_a and after that run the fast boot flash system command again with the system gsi image.

5:21 · This time it should flash without any errors. As you can see, my flashing process has begun. So just let it do its thing. It can take several minutes to complete. On some devices, even after deleting the logical partition, you might still get a space error. In that case, your device doesn't have enough space to install that particular gsi. So you'll need to choose a gsi with less space and fewer modifications.

5:45 · Once the system image has flashed successfully, run these last two commands. Fast boot erase user data and after that fast boot erase metadata.

6:00 · Once that's done, unplug your device and reboot it. This time, your device will reboot into the installed GSI ROM. Now, this process usually takes less than 10 minutes to boot your device into the GSI on the first reboot. It's also possible that your device might never reboot and get stuck on the Android menu. Don't panic. In this case, you'll need to flash the VB meta file as well using this command. You can find the VB meta file bundled with your device firmware.

6:27 · Most phones will boot the gsi without needing VB meta, though. So, as you can see, our device has rebooted successfully into the GSI ROM. Now, I need to tell you something important.

6:37 · This isn't exactly a simple thing to do on your phone. Before doing anything, make sure to take a backup of your phone's data. And here's the best thing you can do. While your phone is in fast boot mode, type this command in the bug jagger app. Fast boot getvar all. This will reveal all the details of your device like slot count, IMEI number, and many other things. Save all of these details. Also, make sure to watch a video specific to your phone model just in case anything goes wrong. Check if it's possible for your phone to be recovered from a hard brick state. So, that wraps up today's video.

7:08 · If you found this guide helpful, don't forget to hit that like button and subscribe for more tutorials like this. If you run into any issues or have questions, drop them in the comments below and uh I'll do my best to help you out. Thanks for watching and uh I'll see you in the next