aircel dongle huawei e1750c problem after upgrading firmware

[jackass]

hi every one... Last year i bought aircel dongle Huawei e1750c. i have unlocked it and used for 4 to 5 months but recently i have upgraded my devices firmware after upgrading i am unable to use other sim accept aircel... actually the main problem is to create costume APN for the other sim. so please if you can please please help me to create costume APN for new firmware.thanks a lot in advance........