fenix 2: Update without a computer?

Asking for my brother.

I know this is the fenix 6 forum, which is busier than the 7. Has the forum for the 2 been archived, or hidden? I could not find it. 

My brother does not have a PC or a MAC. He does have a chrome book, and an apple phone. 

Is there a way for him to update the firmware on his 2?

Thank you in advance.

Eric

PS. Last time he was with me, we used my PC, and I see "Version 4.50", so maybe it is up to date? But there is something he said he wanted to do but couldn't, so maybe I need more info. 

Note: We live in different states. :-)