pymcuprog problem with chip erase; "device not supported"

[tangiblewaves]

Hi, happy megaTinyCore user here!

I just switched my development environment to a new machine and can't figure out how to solve the following issue:

I try to erase a locked Attiny with pymcuprog, which worked flawless on the old machine; command line:
pymcuprog erase --chip-erase-locked-device -d Attiny1614 -t uart -u com8

On the new machine, I get an error "pymcuprog: error: unrecognized arguments: --chip-erase-locked-device"

Changing the command to
pymcuprog erase -d Attiny1614 -t uart -u com8

brings:
"Unable to setup stack for device attiny1614
Currently supported devices (in 'devices' folder):
atmega328p, atmega4808, atmega4809, atsamd21e18a, atsamd21g18a, attiny1607, attiny1627, attiny3217, attiny416, attiny817, attiny84a, avr128da28, avr128da48, avr128db48, pic16f15244, pic16f15376, pic16f1768, pic16f1779, pic16f18446, pic16f18456, pic16lf18456, pic18f16q40, pic18f16q41, pic18f47k40, pic18f47k42, pic18f47q10, pic18f47q43, pic18f57q43, pic18f57q84, pic24fj128ga705, uc3a3256"

I have no clue what is missing here; the core folder tools\libs\pymcuprog\deviceinfo\devices of platformIO contains the attiny1614.py.
I'm running the command directly within the folder tools\libs\pymcuprog; PATH settings for Python are identical to the working installation, I have no more ideas.

Any help is highly appreciated; I'm sure it's some stupid thing I'm overlooking! Thanks!