Help with Symbian OS for Nokia E63?

[Gal]

I have a Nokia E63. I am quite pleased with the phone but I was wondering if I could upgrade the OS? And how would I do it and which OS could I upgrade it to?

~ALSO~
What is the best browser? I am currently using Opera Mini, it's a good browser, my only concern is it is not letting me post on tumblr.? I tried Opera Mobile but it was veeerry slow and it didn't work with tumblr. either.
Is it possible to download iphone&android apps such as instagram, tumblr, twitter off the internet etc.?

Thx xxx

 

[missbee]

there are many social networking and chatting apps, if u havent already, install the nokia store app
http://store.ovi.mobi/default/index/clientsplash/
The e63 can only instal and run symbian and java applications, but ull find some apps that android and ios use in symbian format too, but not all, thats just the way it is. Check the store, its the safest and best place.
U cant change the os to a different os, thats impossible. All u can do is update the current os if theres an update available. Connect ur phone to ur pc via usb and search for updates if there is any
http://www.nokia.com/au-en/support/product/e63/
my e63 is 4 years old, i have never updated it, and it works like a charm, so its up to u.
Opera mobile works a treat for me, super fast. As well as opera mini. So im not sure why its slow for u. Make sure u save heavily used apps like browsers and themes to the phone memory, not the memory card, otherwise it will slow ur phone down and drain the battery. Also, make sure u have the correct browser versions by downloading direct from the site using the phones nokia browser http://m.opera.com
Ucweb browser is another option that works well http://wap.ucweb.com