Blueendless Kimax BS-U35-WF


I have update my Blueendless Kimax BS-U35-WF with openwrt 19.074 and now I do not have access.
I have followed guide, but when I try to login with putty user: root any password does not work.
I reboot the Kimax and the NAS has the last ip before update. Thank you in advance for your help to resolve this issue.