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/// <summary>
/// Extract Main CPU firmware from ICOM IC-R8600 firmware bundle (1.01-1.35 USA and non-USA versions)
/// non-USA versions:
/// https://www.icomjapan.com/support/firmware_driver/?product=IC-R8600(EUR)&frm_type=Firmware&old=true
/// USA versions:
/// https://www.icomjapan.com/support/firmware_driver/?product=IC-R8600&frm_type=Firmware&old=true
/// </summary>
/// <param name="bundle">Firmware bundle</param>
/// <returns>Unpacked data</returns>
static byte[] MainCpuFirmwareExtract(byte[] bundle)