OK !
I have made a modified version according to the suggestions from forum members . The busybox left out , and now it is using the superuser app .You need the uploaded zip file from the original post .
C:\rootgt540v20b>adb push rageagainstthecage-arm5.bin /data/local/tmp/rageagains
tthecage
5 KB/s (5392 bytes in 1.000s)
C:\rootgt540v20b>adb shell
$ chmod 4755 /data/local/tmp/rageagainstthecage
chmod 4755 /data/local/tmp/rageagainstthecage
$ ./data/local/tmp/rageagainstthecage
./data/local/tmp/rageagainstthecage
[*] CVE-2010-EASY Android local root exploit © 2010 by 743C
[*] checking NPROC limit ...
[+] RLIMIT_NPROC={1712, 1712}
[*] Searching for adb ...
[+] Found adb as PID 1239
[*] Spawning children. Dont type anything and wait for reset!
[*]
[*] If you like what we are doing you can send us PayPal money to
[*]
[email protected] so we can compensate time, effort and HW costs.
[*] If you are a company and feel like you profit from our work,
[*] we also accept donations > 1000 USD!
[*]
[*] adb connection will be reset. restart adb server on desktop and re-login.
$
C:\rootgt540v20b>adb shell
# mount -o remount,rw -t yaffs2 /dev/block/mtdblock4 /system
mount -o remount,rw -t yaffs2 /dev/block/mtdblock4 /system
# exit
exit
C:\rootgt540v20b>adb push Superuser.apk /system/app
2456 KB/s (196521 bytes in 0.078s)
C:\rootgt540v20b>adb shell
# chmod 755 /system/app/Superuser.apk
chmod 755 /system/app/Superuser.apk
# exit
exit
C:\rootgt540v20b>adb push su /system/bin
1641 KB/s (26264 bytes in 0.015s)
C:\rootgt540v20b>adb shell
# chmod 4755 /system/bin/su
chmod 4755 /system/bin/su
# su
su
# id
id
uid=0(root) gid=0(root)
# cd /system/xbin
cd /system/xbin
# ln -s /system/bin/su su
ln -s /system/bin/su su
# reboot
reboot
You should wait for this part until the phone fully up , because when you type su the superuser app should be come up on phone's screen and you need to allow it .
C:\rootgt540v20b>adb shell
$ su
su
# id
id
uid=0(root) gid=0(root)
#
Thanks for the cooperation to everybody !