*.sis *.jar unknown file format ???

[RenZ0R]

I think ive killed my phone, I managed to install Fexplorer latest version on my brand new phone. Since then I get unknown file format when downloading a .sis file, or file is corrupt when getting a *.jad or *.jar file from the internet, ive tried a few different apps/games and all are the same.

So far im having to download from the internet untill I can afford a blue tooth adaptor, so as u can imagine its costing me quite a bit to keep testing different apps, I was looking on this forum, and ive seen a few posts about formating the phone, is this necessary to restore the factory defaults ? Ive nothing to loose on the phone cause ive nothing installed ... whats the best option for me ?

Thanks

[blue23mkti]

yes, i recommend to format it.
ive been thinking that too on my 3650. but i'll do that later this weekend.

why do you download off the internet? don't you have infra red?
most laptops have infra red.