Cannot lunch any binary on Oleg's firmware

[BooBoss]

I've just installed Oleg firmware and everything seems to be fine... but:

I cannot launch any file from /opt/bin.

It says:
-sh: sudo: not found

Where sudo is example of course.
HDD is working, IPKG installed and other few apps. Also I didn't have any issues during install. I was using tutorial from WL-500W section about installing IPKG.

I'm little familiar with Linux and can't figure out what's going on.

Second thing: /usr/local/sbin/post-boot doesn't lauch automatically after boot. I have to run it manually. Of course also don't know why.

PLZ provide me some help.

[al37919]

You didn't read the topic you mentioned carefully:

If you are using oleg, replace the line "ipkg.sh install ipkg" with "ipkg.sh install ipkg-opt"

[BooBoss]

I know :-( I found it later and figured out I've missed it. How Can I now reverse these changes and make it work? Isn't it best to reinstall firmware and start from begining?

Also I have another few questions.
1. Can some one tell me in wchich memories specyfic folders exists? (i.e. /usr/local in RAM).
2. After upgrading the firmware to new or same one, which data will be lost or reversed do defaults? (for example settings made on WWW panel)
3. On WWW panel there is an option to save whole flash to file? Does it save absolutelly everything? (i.e. mentioned settings in point 2).