I just received my FP3+ I would like to install a custom ROM, iodéOS, on my device. I already did a lot of research but I’m not sure about every step. I just don’t want to brick my brand new device. During my research I learned that FP3+ has an A and B flash slot. Now would it be possible to flash the unused slot with iodéOS and leave the other with FairphoneOS on it as it is?
I found a something to flash both slots with the stock ROM so I assume it will be possible. However the install guide iodéOS provided is quite vague for someone who has never flashed a ROM.
Currently I think I will need to do the following:
Using the guide to install LineageOS I should follow all steps up until step 5.
Now, I know I will have to execute “fastboot set_active other” and I believe it’s best to execute that now, before I boot into recovery?
Then I just execute step 5, following the LineageOS recovery instructions but use the iodéOS recovery.
Will this be okay?
Now, to be able to switch without my PC I can use TWRP. From what I read, I should first boot into TWRP then flash it, else I will break things, correct?
If I manage to basically dual boot my phone, system updates will brake the other install so should I never update, just manually re-flash the new version so I don’t break things?
I also understood that there’s only one DATA partition, will this be a problem as I’m using two different ROMs? I don’t plan on using the FairphoneOS a lot beside a 1 or 2 apps if they don’t work on iodéOS, I just like to still have it in case something goes wrong. They are banking apps that do not function on rooted phones and I’m afraid if I flash over the FairphoneOS ROM it might detect it and I don’t want to actually root it and use Magisk to hide it (although I heard from a friend it will work that way. Thank makes me think, can I root only the iodéOS ROM if necessary?).
Sorry for the long post, I just want to be sure about the steps I take because I don’t want to brick my device. The battery of my Microsoft Lumia 950 XL is too bad so I needed a new phone. I don’t want to join the Apple ecosystem and I don’t like Google knowing everything so I hope my FP3+ with a custom ROM will get me going for another 5 or more years. (In case anybody is interested on using a Lumia in 2022, let me know)
Thank you in advance.