I140- Wrong priority date printed

[ArunJAD]

My friend’s I140 is approved with wrong Priority date printed on it. LC was filed in Feb 2013. Due to a query so it got approved this year and I140 was filed with PP in Aug 2014. I-140 got approved with wrong priority date Aug. 2014. Attorney has filed for correction but does not know how long will this process takes as this does not comes under Premium processing. Now my friend wants to change his employer and there is an offer letter lined up. But this issue is blocking him. If he files LC with new employer without correcting this issue, which priority date can he use, Feb 2013 or Aug 2014?

Any work around please?