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You Need:
DB25 Male Connector or LPT Cable
Soldering Iron
Parallel port on your PC
USB port on your PC
ISP Programmer:
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HEX I used:
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How To:
Solder these points from the Jailbreak to the LPT Cable or connector
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Then you should have something like this
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Programming:
Open ISP Programmer and click Setup
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Type these settings:
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Click OK
Connect to the PC parallel port and plug into USB aswell
Press Reset ON (I changed paragraph Hz to 16 before the reset)
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Next press, Read Signature and if all goes well, this tells us what our device is
AT90USB82/162, Flash: 16KB, EEPROM: 512 bytes
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Click ERASE.
Now load the HEX (e.g Bootloader_AT90USB162v105.hex).
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Click on "Fuses and lock bits" to check the status of the fuses in our device.
The factory fuses are 0xF4, 0xD9, 0x5E
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If not so, do them at that value and click on "Program" or "Program fuses and locks" (although deleting the AT and program our hex and should be with that value).
Well, it only remains to give the button "Erase & Program All" in the window pricipalmente and we will have the bootloader restored.
Thank You and good luck