Kartu, not at the moment.
(Thought that it was done in boroda or amutin FW via JS, but can't find a reference now)
A quick check of the disassemblies shows that the 3 functions (eBook_rotate, ebookEinkDoRotate and ebookSubcpuDoRotate) are implementd in a different way for the 600 as for the 300/505.
The op-code is optimized, so there is not much space for patching.
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