Modify unicode encoding in "/usr/share/sqlmap/tamper/charunicodeencode.py":
while i <len(payload):if payload[i]=='%'and (i <len(payload)-2) and payload[i +1:i +2]in string.hexdigits and payload[i +2:i +3]in string.hexdigits: retVal +="\\u00%s"% payload[i +1:i +3] i +=3else: retVal +='\\u%.4X'%ord(payload[i]) i +=1