yes, and yes.
To do it with gadget bridge, make sure your PineTime is connected via Gadget Bridge.
Then go to the GitHub page and grab the DFU file here: https://github.com/InfiniTimeOrg/InfiniTime/releases/download/1.6.0/pinetime-mcuboot-app-dfu-1.6.0.zip
Then use your file manager to "open with" and choose "Gadget Bridge Firmware Updater"
It should upload to the watch (takes a couple of minutes, so make sure your watch is charged).
Then it should reboot, and you're good to go. 👍😊 @PINE64 @ern