Electrical problem
2000 Peugeot 307 4 cyl Front Wheel Drive Manual

hi have a 307 hdi,was running great,left for awhile and battery went flat,recharged battery but wont start,checked and found ingecters not operating,been told by auto elec that immobiliser not unarming as key has lost code,how to recode or by-pass immobiliser,please thanks...