There is no such firmware version as 5.0, the latest version of firmware is 4.3.3,anyway if you want to upgrade your iphone, you need itunes software installed on your computer and a IPSW file for firmware.
download itunes software :
iTUNESfirmware download :
IPSW (prefer what firmware you wish)
Here is the procedure :
(Be sure to back up your data first because all files will be erase.)
1. Plug your iphone to the computer,some drivers will be install and wait until your phone recognized by your computer.
2. hold "shift" key then click restore, a firmware will be ask so locate the firmware file you download then tick ok. it will automatically do the process so just wait until it's done.
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