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RM48L952: Unable to Halt Device

Part Number: RM48L952

First, everything is OK,

Then, I downloaded modified firmware which has some bugs;

Finally, I can not downloaed firmware anymore.

 When downloding firmware ,the error  displayed is:

Fatal error: Failed to connect to the xds100 emulator(connect CPU)..

(Error -2062 @ 0x0)

Unable to halt device. Reset the device, and retry the operation. If error persists, confirm configuration, power-cycle the board, and/ or try more

reliable JTAG settings(e.g. lower TCLK).

(Emulation package 5.0.747.0)

any one can help me? Thanks a lot.