In this post we have accumulated various countries firmware files for Huawei E8259. If you have uncustomized firmware E8259 then it can be easily unlocked with a correct unlock code. But what if you have a customized firmware router and there is no way to enter the unlock code, or you want to change the firmware?
If you have a new firmware of Huawei E8259 device or want specific firmware, then let me know via comment. It will be uploaded soon.