Historical update tools included the Nokia Software Updater and Ovi Suite.
Download the stock firmware (RM-645 for C5-00, for example). file in Nokia Firmware Editor and press "Extract". nokia c5 rom
Go to Flashing > Firmware Update . Click Browse to make sure it sees the files, then click Update . Historical update tools included the Nokia Software Updater
Supports MicroSD cards up to 16 GB (up to 32 GB on C5-00.2). Firmware/ROM Updates: nokia c5 rom