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AWR1642: Meta Image Size

Part Number: AWR1642
Other Parts Discussed in Thread: UNIFLASH
[2018/5/21 下午2:31:17] [INFO] CortexR4_0: Downloading [META_IMAGE1] size [1083716]
[2018/5/21 下午2:31:17] [ERROR] CortexR4_0: Invalid file size
[2018/5/21 下午2:31:18] [ERROR] CortexR4_0: FAILURE: File Download Failure!! Ceasing session...
[2018/5/21 下午2:31:18] [ERROR] CortexR4_0: Aborting operations...
[2018/5/21 下午2:31:18] [INFO] CortexR4_0: Disconnecting from device on COM 15
when my metafie is bigger than 1MB ,the uniflash can't program it into 1642, I don't know why this happens?