How to get Samsung Galaxy S2 back to 4.1.2?

[SAMSUNGKID123]

Hello, first time at this, I basically put my phone back to 4.0.3 with Odin V3.07 last week and now I really want to get it back to 4.1.2 Jelly Bean, while flashing on Odin, I put the PDA in and it says this
" <OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> I9100XWLSD_I9100VODLSC_I9100BULS1_HOME.tar.md5 is valid.
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS.. ".

The when I click start it says "<OSM> All threads completed. (succeed 0 / failed 0)"

What have I done wrong? Can anybody help me please?

 

[DroidXcon]

Hello, first time at this, I basically put my phone back to 4.0.3 with Odin V3.07 last week and now I really want to get it back to 4.1.2 Jelly Bean, while flashing on Odin, I put the PDA in and it says this
" <OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> I9100XWLSD_I9100VODLSC_I9100BULS1_HOME.tar.md5 is valid.
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS.. ".

The when I click start it says "<OSM> All threads completed. (succeed 0 / failed 0)"

What have I done wrong? Can anybody help me please?

Welcome to Android Central

Is the file you are trying to flash specifically for your device and carrier? if it is def correct then try rebooting your computer, using a different cord and/or port.
if you are still having trouble try finding the PIT file for your device and flashing that along with the tar file

 

[Golfdriver97]

Hello, first time at this, I basically put my phone back to 4.0.3 with Odin V3.07 last week and now I really want to get it back to 4.1.2 Jelly Bean, while flashing on Odin, I put the PDA in and it says this
" <OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> I9100XWLSD_I9100VODLSC_I9100BULS1_HOME.tar.md5 is valid.
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS.. ".

The when I click start it says "<OSM> All threads completed. (succeed 0 / failed 0)"

What have I done wrong? Can anybody help me please?

Welcome to the forums!
I agree with DroidX, You may even need to download updated Samsung drivers for your PC as well.

 

[Deanig_12]

you dont wanna go to 4.1.2 omg ive never experiance a battery draining os as bad as i have :/