Sony logo boot loop

Hi,

Unlocked via Sony website which seemed to go fine but on rebooting I'm in a constant boot loop. Tried flashing stock D2305_18.0.A.1.30_Global Generic by Sai Arkar.ftf and C2004_15.5.A.1.5_Customized_BR_1274-5443_R3C.ftf. Both flashed fine but have not resolved the problem.

Can anyone help please?

Thanks