Why? The downgrade instruction tells that you have to update to the actual firmware, because 4.0.2 is too old and has many issues.
Yes, exactly
Yes. To any, including the latest
No. 4.0.2 does not have PW/TQ settings. This firmware does not even know about RS version. 4.0.2 is required for...
yes, as the normal EP8. For Bluetooth you need downgrade to 4.0.2 for the speed derestriction and then update to the actual firmware. With PCE interface the downgrade is not required.
EP801/EP6 overall Torque/Power settings are now adjustable in then new 1.18 version
So it's possible to make EP801/EP6 RS into the full power motor via Bluetooth
You can see the "regulation log" in the STUnlocker. STUnlocker does not write into the log any data. Regulation log is used by Shimano to compare current settings of the motor with the factory settings. If you change settings to default you'll not see any warnings in Shimano software and Shimano...
This is not STRide related question. Anyway, STUnlocker informs you which settings are not default and you HAVE TO change all settings back to default/stock before visiting dealer/shop center.