yeah problem is the codes, without it you cant run anything.
The .tiff exploit which was for 2.0's to downgrade used an exploit found in a .tiff file to execute code which wasnt checked, so were able to edit the version number to 1.0, so people could run the 1.5 update.

Currently no exploit in the web browser has been found to be able to execute code, so no go yet.

Altho i've been searching up on some java exploits which look promising

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