That was your first mistake. The patcher you used was NOT intended for 2.9.0, rather for 2.6.1.
We in the community try very hard to warn you about these issues but......
There is a 2.9.0 version
See
https://www.mobileread.com/forums/sho...&postcount=249
Additionally
https://www.mobileread.com/forums/sho...d.php?t=220171 links to the various patches.