Firepower 2130 running ASA

What software version are you all running? We are looking for a stable release. Cisco's recommended releases are all interim release.

Our company is currently running 10 ASA 5510 across the globe and they are currently running great. But there's been a mandate from above to upgrade to Firepower 2130. So we already purchased 10 units to replace.

Its been a slow process because the first site we migrated to has been a total nightmare. Dropping multicast packets, constant power cycling. Just recently we took it out of service to upgrade the firmware from 9.8.2 to 9.8.4.26. Then Cisco just recently came out with 9.8.4.29 and we decided to install that but .29 seems to be buggy as well, so we rolled back to .26. I can't go into all the details of bugs, but major ones are the multicast module hangs, fxos failing ftp/sftp/scp/tftp downloads at 85% and random power cycling on standby unit.

I'm wondering if any of you currently have firepower 2130 running ASA and what software version are you running. And is it stable? We already have 10 firepowers purchased and it is too late to return them.

Thanks in advance.