Dont worry
my dear friend. 5210 is not supported with dark lemming's flasher becuase of 5210 having a 48 bit flash loader. The only software which supports 5210 is KNOK XP MOBILE or later on you can download its new phoenix version from here
http://www.schwantz.hpg.ig.com.br
Well and then full flash the phone from it if you want the full flash file of 5210 version 5.16 contact me.
groups.yahoo.com/groups/haseebali