Hello, is there any technical difficulties or additional charge to switch a fp4, or fp5, from Android to /e/OS or from /e/OS to Android ? If we do a switch, can we also move back to the previous if it is to suitable for the use ? Thank you very much
Welcome to the forum!
Additional charge: no
Technical difficulties: well, it’s not just pressing a button. So you’ll need some technical abilities
Yes, it’s possible to move back.
And (you may call it nitpicking): /e/OS is also Android, but stripped of Google services. This is why standard (stock) FairPhone OS is generally called FPOS.
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For FP4 there still seems to be the easy-installer
https://doc.e.foundation/easy-installer#list-of-devices-supported-by-the-easy-installer
But there have been reported problems. I think there is a reason why they call it Beta 
Best to look this up directly at the Murea forums.
Also see the device list and the references to install guides there
https://doc.e.foundation/devices
For FP5 decide for yourself if this falls into the category ‘technical difficulties’
https://doc.e.foundation/devices/FP5/install
similar for FP4 without the easy-installer
https://doc.e.foundation/devices/FP4/install
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