Default route invalid after upgrade

After upgrading a box from 2.7.20 to 2.8.8, routing nolonger works.
It seemed as though it got the interfaces crossed, so I cleared the
config, setup r and system reset didnt seem to take everything out,
so took the hotspot/firewall stuff out manually.

interface print
Flags: X - disabled, D - dynamic, R - running

NAME TYPE RX-RATE TX-RATE MTU

0 R ether1 ether 0 0 1500
1 R ether2 ether 0 0 1500

ip address print
Flags: X - disabled, I - invalid, D - dynamic

ADDRESS NETWORK BROADCAST INTERFACE

0 xxx.9.241.19/29 xxx.9.241.16 xxx.9.241.23 ether2
1 xxx.9.242.1/24 xxx.9.242.0 xxx.9.242.255 ether1
ip route print
Flags: X - disabled, I - invalid, D - dynamic, J - rejected,
C - connect, S - static, r - rip, o - ospf, b - bgp

DST-ADDRESS G GATEWAY DISTANCE INTERFACE

0 IS 0.0.0.0/0 r xxx.9.241.17 1 ether2
1 DC xxx.9.242.0/24 r 0.0.0.0 0 ether1
2 DC xxx.9.241.16/29 r 0.0.0.0 0 ether2

The gateway shows as invalid and pinging the gateway on the same
subnet as the ether2 gives 'no route to host'

ip firewall connections show connections, other Mtik neighbors see the
box, but cant seem to ping it. It sees some arp addresses.

Any suggestions welcome KenK.

the 2.8.8 version had a problem with system reset, you should upgrade your routers to the newest version 2.8.11

Thanks Normis.

How do I do that when the network routes /interfaces are broken?
If I load 2.8.11 floppy set - will that not format the disk?, and I loose the software key because of the format. Presumably netinstall will do the same thing. Is there some way I can preserve the disk key while upgrading the software through floppys?

Thanks Kenk

no, reinstalling doesn’t mean you will lose the key. if you have problems, please contact support@mikrotik.com