After updating my C9 hub this morning it no longer is visible. I have rebooted several times and have the green LED. It's assigned IP address does not show up in my mesh network. Nothing else changed. It does not appear be accessing the mesh under any IP address. Anything I can do with the hub itself? No access via the app or my browser. Stuck.....
Did you set a fixed IP on the HE hub using the Network settings, or an IP reservation on your router?
Did you try https://findmyhub.hubitat.com/ yet?
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First a correction - it is a C8PRO. Yes, using the findmyhub link it found the hub and it is showing the correct IP address which is assigned to it by my Google Mesh.
... and after finding it with the link it is all working normally. Thanks for responding. I've saved that link for future use.
OP can probably avoid this issue in the future by doing this.
A DHCP reservation is usually a simple way to assign an IP address that won’t change to a specific device.
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You should still answer this question:
You should set a DHCP reservation for your hub as suggested by @marktheknife above.
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I think he did, though not 100% clear. 
@norv.orbus - are you saying that you did set an IP reservation on your Google router, or ?
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Yes, assigned a specific IP address in my Google Mesh some time ago to solve and issue with my Kindle Fire tablets failing to find the hub from time to time.. That was still working correctly. To be clear, the only thing I did to resolve this issue is use the FIND Hub link as suggested. That fixed everything. So appears that in the process of running the update to 2.4.0.154 the hub got "lost" and was not even visible to my mesh. The Hubitat link fixed that.
Thanks for responding with suggestions and help.
The link wouldn't "fix" anything. It just offers a few ways to scan your network for your hub. If it wasn't working before at the same IP address but is now, that's just coincidence. Glad it's working, in any case! But if something comes back, it's probably worth troubleshooting since this wouldn't really fix whatever that is.
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Absolutely, the only thing that the update did to your hub related to you not being able to find it was the reboot that occurs during an update. That link I gave you doesn't fix anything just a link as Robert explained.
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Thanks for that clarification. I did not word that vey well. When I went to the link I had the option to click on "Advanced Discovery" but below that I saw my hub listed under "Discovered Hubs" When I clicked on "Connect to Hub" it did and all was fine after that. I don't know what changed. The time frame between running the update and not being able to find the hub to the correction was probably a little over an hour. I did not actually run anything or take any action other then posting my help request. So somewhere along the line the hub->mesh connection seemingly healed itself. Next time I run a Hubitat update I will be careful to observe the steps and note the details if this happens again.
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Thanks for the additional details...
Terminology issue here..."hub->mesh" can be a confusing term around here, as there is a feature on the HE hubs called "hub mesh" which allows you to share devices between hubs.
I think your "hub->mesh" statement is about the hub reappearing on your mesh Wi-Fi network, right? So when talking about the hub's network connection, better/clearer around here to say "hub->network" connection. 
If you want to you can test things out right now w/out waiting for an update...simply reboot your hub (which is what happens at the end of a platform update), via Settings>Reboot, and after it reboots confirm that you can still access your hub at it's "normal" IP address reservation that you have on your router. If it works normally, then what happened may have just been a one-time networking glitch where the hub and your router had some short-terms issues negotiating their connection. 
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