It sounds like that person may be using an older version of the Teensy loader that didn't know about the 4.1. If Help -> About doesn't say "Teensy Loader 1.53" (or newer), it's time to upgrade.
You could try replacing these lines 344 and 345 in teensy_loader_cli.c
char reboot_command = 134;
int response = usb_control_msg(serial_handle, 0x21, 0x20, 0, 0, &reboot_command, 1, 10000);
with these
Depending on which Teensy it is; I've yet to get the "-s" option to work with a Teensy 4.1. The usage text does say it's just for the 3.x series, but I was hoping!
It does see main power for several hours pretty much every day. But even so it's been off for at least 12 hours a day through all that time, and that's a very conservative estimate.
It was in the usage text from the program itself (source line #43 in teensy_loader_cli.c):
earth:~/Documents/src/teensy_loader_cli $ ./teensy_loader_cli
Filename must be specified
Usage: teensy_loader_cli...
I missed that. And as I've had the same dollar store CR2032 cell in a T4.0 setup since October of last year I was a bit concerned. So I just measured its in circuit voltage and it's still reading 3V and keeping the time...
Curiosity got the better of me. The command line loader definitely does not reset the time when uploading a new sketch. It does require pressing the button on the T4.1 to start the download; the soft reset option didn't...
Have you tried using the command line version of the loader? From admittedly just a quick glance, I can't see any code in there that sets the target's time on loading. You would have to compile the loader for your...
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