use the ACER a1 dl tool and flash latest .BIN file tht is found on modaco.com !
link for acer a1 dl tool : uploading.com/files/e696bc64/A1_DL_Tool3.1_j%2540y.rar/
here is the link for .BIN file : hotfile.com/dl/80920716/d4ef8d0/4.002.08_EMEA-GEN1_05.01.05_A1_PASS_MdB.zip.html
make sure u have installed all the drivers (found in cd provided along with phone, or get from :loadbalancing.modaco.com/download.p...deaga2n2d0pn68v )
1. extract the a1 dl tool and run the application as 'run as administrator'
2. connect ur phone to the pc.
3.after opening, click on browse and select the .BIN file that u have downloaded (hotfile link,dnt ask were is the bin file, extract the .zip file to find it
4.and finally, click start & grab a cup of coffee/tea
last step : HIT THANKS
find me here for further help : facebook.com/jaykrishna94