Can i reinstall isight firmware?

Question

When I try to use my standalone isight camera a message appears "Your camera is in use by another application" in the ichat camera window.
I've tested it in various firewire ports and different computers(G4 and IBooks) with different OS (10.4.9 and 10.3.9), always the same result.
When I turn it on, rotating the lens, the green light is always on.
In the System Profiler it appears:
iSight:
Manufacturer: Apple Computer, Inc.
Model: 0x8
GUID: 0xA270000018C66
Maximum Speed: Up to 400 Mb/sec
Connection Speed: Unknown
Sub-units:
iSight Unit:
Unit Software Version: 0x102
Unit Spec ID: 0xA02D
iSight Unit:
Unit Software Version: 0x10
Unit Spec ID: 0xA27
iSight Unit:
Unit Software Version: 0x11
Unit Spec ID: 0xA27
iSight Unit:
Unit Software Version: 0x12
Unit Spec ID: 0xA27
Product Revision Level: 1.0
Could it be a problem with isight's firmware, if so, how do I reinstall it?
Dual 1 GHz PowerPC G4   Mac OS X (10.4.10)  
Dual 1 GHz PowerPC G4   Mac OS X (10.4.7)  
Dual 1 GHz PowerPC G4   Mac OS X (10.4.7)  
Dual 1 GHz PowerPC G4   Mac OS X (10.4.7)  
Dual 1 GHz PowerPC G4   Mac OS X (10.4.7)  

Answer 1

You're welcome, Antonio.
Although your iSight Firmware version should have already been updated to 1.0.3, Software Update... on both computers is reporting that no updates are required. Moreover, the info you furnish above shows that 10.3.9 reports your iSight's Firmware version is 1.0.2 while 10.4.x reports version 1.0 for the same iSight.
(1) Based on that information, I think that your firmware updates may have been interrupted. Alternatively, this iSight may be damaged. In either case, I suggest you contact your Apple-Authorized Service Provider for professional help.
(2) If you want to continue to try to work this problem and are comfortable with UNIX or OS X, you can back up your Macs' hard drives or at least your Home folders now.
CAUTION: Do not neglect the backups. Moreover, be advised that manually moving, renaming, or deleting files outside your ~/Documents folder is generally a BAD idea in OS X unless you KNOW what you are doing, so be cautious if you decide to try finding and moving these files.
After you have backed up, look in your Finder > Go > Utilities folders to see whether they contain iSight Firmware Updaters.
Also look in your Macs' (not your home folders') Hard disk name > Library > Receipts folder and your Macs' (not your home folders') Hard disk name > Library > Packages folder to see if the iSight updaters are there.
Because Software Update... on both your Macs show that your software does NOT need to be updated, the updater is probably stored somewhere on your Mac. A manual search will be required. You will not likely be able to find this with Spotlight.
If you can find these updater items, temporarily move them to another location inside your Documents folder, and then restart your 10.3.9 Mac. Software Update... or the Firmware Download MAY now work to update your Firmware. If not, or if you damage your Mac's startup software beyond repair while attempting this fix, seek the help of an Apple-Authorized Service Provider.
(3) Let me again suggest that you consider having an Apple-Authorized Service Provider do this work unless you are knowledgeable of OS X.
If you do not have access to a local Service Technician, you may find Apple's International Technical Support Contact Information or web-based iSight Service Request worth considering.
Please let us know what it takes to resolve your problem.
Cheers,
Jim
  Mac OS X (10.4.10)    G5 DP 1.8     External iSight