We can downgrade 5.08, but has anyone heard if they're working on a way to downgrade Bootloader 5.09?
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Any News on Bootloader 5.09?
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My impression is that the Dev Team is always looking for a bootloader exploit so that they can permanently pwn the 3G/3GS, but that CPICH and others have been through the thing pretty thoroughly without success. The bootloader is a very small bit of code, with correspondingly few opportunities for exploitation.
That sucks, since I believe it was the firmware change to 5.11.07 that started causing the wifi problems for iPhones.
The error in bootloader 5.08 which allows Fuzzyband to work was corrected in 5.09 and newer versions. To date, no exploit has been found, I wouldn't expect to ever see a method to downgrade bootloaders or basebands except in that one specific case.