Altering file inside firmware requires new checksum?

There isn't a general answer to this question, the answer depends on the device, and what checksum it uses to verify the firmware.

There isn't a general answer to this question, the answer depends on the device, and what checksum it uses to verify the firmware. In general a checksum is used to verify the file hasn't got damaged during transfer. It could be that the checksum is simply a CRC or MD5 or other hash, appended to the end of the firmware, or it could be in a header somewhere.

If you are unlucky then the checksum is combined with a digital signature which would prevent you from 'correcting' the checksum for your changes. If you are lucky then someone will be able to tell you for format for the firmware and what the checksum algorithm is.

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