I bought a ZTE(Chinese brand) H618B router. The vender said that even FW updating fails, it can always be recovered because the chip is S29. So I want to know, is it true? And what about WRT54GS V3? Is it still S29? Becuase once I failed to updating FW. I used tftp to flash the original FW firstly, then flash DD, then flash TT. It recovered in the end.