Installing GrapheneOS without desktop or laptop

doredo

I just bought a Pixel 9a with the intention of installing GrapheneOS. I don't own a laptop or desktop; I use my android phone (Samsung Galaxy A52s) and Steam Deck for all my computing needs, both of which meet the requirements listed in the official installation guide (Android 14 and Arch Linux respectively). However, I can't find information about how reliable using these devices are for installing Graphene. My intention was to just use the web installer. Because this new Pixel cost me a lot and I don't want mess around (potentially wasting money) I'd really appreciate advice or experience about these methods.

Thanks in advance!

Ilgar

doredo

https://grapheneos.org/install/web#prerequisites

Google Chrome
Microsoft Edge
Brave (with Brave Shields disabled, since it caps storage usage at a low value to avoid fingerprinting available storage)
On Android, disable desktop mode for the browser

if I don't trust other os I'd factory reset via settings>system>reset options after GrapheneOS install before actually configuring it

KCne

Ilgar https://grapheneos.org/install/web#prerequisites

I think the part that might be more applicable for OP’s situation would be

Officially supported operating systems for the web install method:
Arch Linux
Android 13 [and above] with Play Protect certification

Ilgar if I don't trust other os I'd factory reset via settings>system>reset options after GrapheneOS install before actually configuring it

Checking the verified boot key for your device and using Auditor are the recommended ways to check the integrity of a GrapheneOS device. I’m not sure if resetting does anything to further ensure integrity.

I believe the Samsung phone could be more trustworthy than the Arch Linux PC, due to Android having more security capabilities like verified boot.

Ilgar

KCne I’m not sure if resetting does anything to further ensure integrity.

I'm not sure too but it makes sense to me, if one doesn't want to make extra step. Using Auditor is indeed a must for proper threat model.