Pertinent details:
Multiplus 12/3000/120, with firmware 2702158, connected to Victron LiFEPO4 Smart Batteries, via Lynx BMS and Distributor, and Cerbo GX with Touch 70. System seemed to work fine with old software, but updating seemed prudent.
Downloaded v2702498: Performed update using VE.Flash software via USB MK3 interface. Followed the steps in the procedure and as given by VE.Flash.
After the software update to the Multiplus (MP), the Cerbo no longer seemed to 'see ' the inverter. The unit shows up on the display, but the status says "Off". The device settings for the multiplus still showed v158 for the software (on the Cerbo). Redecting the multiplus settings seems to just stall; No response for over 10 minutes. Cycling power (AC/DC Off) on the inverter showed no change. Tried moving cables, swapping in a test cable for ve.bus. No change. Rebooting of the Cerbo caused the MP to drop off of the device list. Periodically, during the course of the troubleshoot, cyclilng power to the MP, the unit would not turn back on until disconnected from the ve.bus to the Cerbo. This issue was inconsistent, but worth mentioning. Reflashing with the update also had no effect.
Finally forced a software downgrade using VE.Flash to 2702159. After this the Multiplus showed up normally on the Cerbo and seems to be operating normally.
All of the specs and instructions indicate that the 2702xxx is the latest processor, and should be able to accept and run on Ver 498.
Is it possible that one can not upgrade from ver 15x directly to ver 498?