Typically, no, receivers will not need re-binding after a MULTI-Module firmware update.
Occasionally there are changes to protocols which will make re-binding necessary. If this is the case, this will be clearly stated in the new firmware version release notes.
Should I change the firmware channel order?
Typically, no, it is not necessary.
AETR is the default channel order on most MULTI-Modules, but any channel order can be used and none is better than another; it is just a preference.
The main factor is whether or not you have existing models in your radio.
Read the Channel Order page for detailed information about why this is important and what it does.
If you are starting out with a new radio:
Stick with the default (AETR), it's just easier.
It is not necessary to change the MULTI-Module channel order, no matter what models or receivers you are going to use
Before you create any models you should configure your radio's default channel order to match the channel order of your MULTI-Module (AETR is the default)
As you create new models they will work correctly, no matter what channel order the protocol expects as the MULTI-Module will automatically translate the channel order from AETR into whatever the model needs (e.g. into TAER for DSM)
If you still want to change:
Pick your preferred order
Pre-compiled firmware is available for AETR, TAER, and RETA; for other orders you must compile the firmware yourself
Update the MULTI-Module firmware
Set your radio's Default Channel Order
Update any existing models
If you are an existing user with a number of models already configured for another channel order:
If you have configured a number of models with a channel order other than AETR (and you do not want to reconfigure them) then it probably makes sense to change the MULTI-Module's channel order to match your existing models / radio default.
Do I need to fine tune every receiver?
It is usually enough to obtain a single fine tune value once per protocol or receiver type. Variation of +/- 5 between receivers is OK.
You may want to check the fine tune values between different types of receivers using the same protocol, e.g. S6R vs. X8R.
That said, fine tuning each receiver cannot do any harm if you are concerned about it.
Is my drone/plane/car/boat supported?
Many different models are supported by the existing 300+ protocol variations. It is not uncommon for a new manufacturer or model to use an existing protocol.
To find if a particular model is supported:
Use the Search function to search the documentation for protocols which may mention your model