I never said you couldn't update the firmware in the older Spektrum receivers.
ORIGINAL: airbusdrvr
ORIGINAL: -pkh-
The older Spektrum receivers were known for brownouts causing a reset time of a few seconds. The newer Spektrum receivers supposedly have upgraded firmware that reduces reset times to 1/2 a second or less.
As Barracuda said, any receiver can shut down due to a brownout if you don't have a properly sized batt pack for your setup. The long Spektrum reset time just exacerbated the issue.
Partially true. If you have Spektrum/JR receivers bought prior to a year or more ago you could have the original firmware. But even the oldest ones that have been sent to Horizon for firmware update function just like the latest "new" receivers. The oldest original receivers, if updated, function just like new ones.