Flashing via TFTP times-out always at the same "block=1633"

[cunami]

Hi,

If I try to flash my router with does not matter which firmware - tried original one from Asus, Oleg's, DD-WRT, "nvram-clear" - everytime it stops at block=1633 with a timeout...



....
received ACK <block=1631>
sent DATA <block=1632, 512 bytes>
received ACK <block=1632>
sent DATA <block=1633, 512 bytes>
sent DATA <block=1633, 512 bytes>
sent DATA <block=1633, 512 bytes>
sent DATA <block=1633, 512 bytes>
sent DATA <block=1633, 512 bytes>
Transfer timed out.


What could be the problem here? Something with flash memory maybe?

Thanks in advance!