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Linux/CC2538DK: Flashing issue in cc2538

Part Number: CC2538DK

Tool/software: Linux

Hello,

I am trying to flash the firmware in cc2538 but getting error. Target system OS is RIOT and for flashing proces as  per cc2538-bsl. Here also I am doing reset cc2538.

Command line error as bellow,

"ERROR: Can't connect to target. Ensure boot loader is started. (no answer on synch sequence)"

System is Linux ubuntu and that process I am doing through command line. As per booting sequence first write to 0x55 and 0x55 and then wait for response for sync. 

What could be possible solution to resolve this issue. If I get any suggetion/help in this direction it would be more apreciable.