Just successfully updated my iPhone first generation to 2.0 firmare. It works great and I would like to share that method with all my readers.
You need following softwares and firmwares:
iTunes 7.5
iTunes 7.7
Original 2.0 Firmware
Custom 2.0 Firmware
1) Install iTunes 7.7 (you don’t need to uninstall previous version of iTunes), connect iPhone to PC, synchronize(to save all contacts and etc.), disconnect and close iTunes.
2) Open iTunes 7.7, connect your iPhone and hold Home + Sleep/Wake button until it put into Restore more
3) Restore iPhone to Original 2.0 Firmware via iTunes 7.7 (Holding SHIFT on your keyboard press Restore button and select iPhone1,1_2.0_5A347_Restore.ipsw) Quit iTunes when iPhone will be restored.
4) Rename folder C:\Documents and Settings\Your windows account name\Application Data\Apple Computer to Apple Computer backup and My Documents\My Music\iTunes to iTunes backup.
5) Uninstall iTunes 7.7 via Control Panel
6) Install iTunes 7.5
7) Connect iPhone to PC using DFU mode
- Press and hold the Home button and the Sleep/Wake button at the same time.
- After exactly 10 seconds release the Sleep/Wake button. Continue holding the home button until you iTunes pops up a message telling you that it has detected an iPhone in recovery mode.
- The iPhone screen will remain black – important
This YouTube video should help you How to put your iPhone in DFU mode
8) Restore iPhone to Custom 2.0 Firmware (Holding SHIFT on your keyboard press Restore button and select 20_347_Cid.ipsw. If you get 16
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