Unhappy [Q] huh help ! /etc folder problem. while swapping

I followed this tut and got stuck,
http://forum.xda-developers.com/show....php?t=1422158

I followed there was no install-recovery.sh so i was not able to create any backup now my KARBONN a26 is not able to read sd card nor it is showing internal sd card.
Not able to flash rom it says in sp flash tool
Uboot problem plz fill correct checksum value in checksum.ini