seawarrior181/PasswordPump_II — reverse-engineered prompt

Build me an offline USB password manager device like PasswordPump II. I want it to run on an Adafruit ItsyBitsy M0 or M4 and store credentials only on removable EEPROM chips, not in the cloud or on the computer. It should handle about 250 accounts with account name, username, password, URL, group, and old passwords, encrypted with AES 256.

The device should let me browse and enter data with either a rotary encoder or joystick, and also work through a keyboard serial terminal. I also want a simple Python desktop GUI for managing accounts, importing browser password exports, backing up and restoring encrypted PasswordPump files, changing settings, and downloading or updating firmware.

Please include the firmware, the GUI, clear setup instructions for normal users, and any hardware or 3D printable case files needed to make the project usable. Look up current docs online if you need to.