back on stock rom but login does not work

[dieres]

I have downloaded the newest stock rom from tp-link for my wr1043nd v1.
stripped the bin with dd if=[original_name_with_boot_in_it] of=tplink.bin skip=257 Bs=512. Than flashed it . Router has booted and tplink greeter is shown up in Browser waiting for the login user/pass. but admin/admin does not succeed

Someone out there who can help me ??
edit:
closed chrome used iceweasel and admin/admin works.
I am not joking.

[nebbia88]

usually clean cache/cookie works