How to manually program flash with linux command ?

Dear all,

I have used a command in WL500g to upgrade firmware manually long time age.
But now I forgot the command and arguments. It can put trx image into flash without web interface. Could somebody tell me the command ?

Thanks in advance

Jared

Code:

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write image.trx /dev/mtd/1

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Thank you, Oleg!
It really helps me a lot!!