Here are the changes to make to enable telnet on whatever flex you have on your phone (read from the phone with the F&B Z6 fix). This is for all the people who want telnet and want to keep their carrier specific (or country specific or whatever) settings.
Use the instructions given in my earlier thread to read out your CG43 and CG52 and the instructions given here http://www.rasputin007.co.uk/storage/webpages/v8_cg/ to read them and create new ones.

1.In ezx_opera.cfg of CG43, find the [file types] section and underneath the line for application/sdp, add this:
application/x-csh = 3,/bin/sh ,,,csh,|
2.In CG52 under /oss, create a file called telnet.csh. use chown to set its user ID to 48 and chgrp to set its group ID to 9154 (same as the existing .html file). Contents should be as follows:
busybox killall inetd
mount -t devpts devpts /dev/pts
inetd /etc/inetd.engr
3.In CG42 under /preloadapps, edit the SysRegistry file. Find the entry that says "Name = Web Access" and change the GroupID and UserID from ezx to root.