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LPC17xx can't enter ISP mode

Hi,
I got this problem with my LPC1768. I was working on my project and tried to use PLL, but I set to big MSel and my LPC is not responding now. I'm programing through JTAG with H-Jtag but it reads only signature of uC and nothing else. I tried to enter ISP mode but it seems not to go into. I put line 2.10 low and reset but flash magic and lpc21isp don't get respond from it. I'm sure I using good lines and UART0. Can anybody help?

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