Hey Karel!

 KK> Do you happen to know some easy description/link where to read
 KK> how I can use my previous approach?

See https://www.linuxfromscratch.org/livecd/ for a potential 'fix'.  They claim it's abandonware but I am guessing it could lead you to where you wish to go with it.  Also I believe slackware has some ideas worth exploring in terms of live
CD/DVD/USB thingies.

Myself I am waiting for a working aarch64 linux-6 kernel for an orange pi 5 so that can be liberated from the evil clutches of the Debian and/or Android crowd(s).  I am hopeful it will be soon and I am sure lfs will be part and parcel of that much needed fix.

If not I still have x86_64 to brag about.  :-)

 KK> (maybe it was just I misbehaviour that time).

Much has changed since 2002.  Alan's advice is well worth exploration.

Life is good,
Maurice

 o-   o-  -o   -o    o-   o-   o-   o-  -o    o-  -o    o-  -o    o-  -o   -o
/)   /)    (\   (\  /)   /)   /)   /)    (\  /)    (\  /)    (\  /)    (\   (\
^^   ^^    ^^   ^^  ^^   ^^   ^^   ^^    ^^  ^^    ^^  ^^    ^^  ^^    ^^   ^^
... Blind by¨ bam eagum se ¨e breostum ne starat.
    He is blind in both eyes who does not look with the heart.
--- GNU bash, version 5.2.15(1)-release (x86_64-pc-linux-gnu)