Note: You do this at your own risk!!! your GDSF is not something you should mess around with unless you know what your doing and take the relevant precautions!!!
We will be using SETool2 Lite which can be found here in the topsony download section
OK this is a little guide on "resetting" DB2020 Total Call Time that we see in our service menu >*<<*<* Service Tests/Total Call Time
Before:
Firstly we must make a backup of our GDSF area just in case things go bad, look at the image below and select your phone model in the highlighted drop down box and press "Read GDSF!!!" and follow the instructions given by SETool2 Lite, a file named after your phones IMEI# will be placed in the SETool2 Lite folder... (Keep this file VERY safe).
Now its time to reset our Call Timer back to "0", start up SETool2 Lite and select your phone type from the drop down box, now add the DB2020_reset_total_call_timer.txt file to the Misc Files section as shown in the preview, then press "Write SCRIPT!!!" and wait for SETool2 Lite to finish.
After:
Tested on K800@K810 CID52 (Should work will all DB2020 though)