Updating Firmware: Are batteries needed?

I am about to update the firmware on a couple hundred AudioMoths (firmware version 1.2.0) and would appreciate some clarification on the updating process. I am aware that firmware versions older than 1.3.0 will require a paper clip to conduct the "manual switch instructions". From my understanding, the process is the following

-Open flash app

-Take an AudioMoth (WITHOUT batteries)

-Move switch to CUSTOM

-Connect AudioMoth to device vis USB (LEDs should start flash)

-Use a metal paperclip to connect the two contacts marked "PROG" and hold firmly until a tune is played and LEDS stop flashing (Flash app should say "Found AudioMoth in flash mode with a serial bootloader")

-Move switch to USB/OFF

-Press Flash AudioMoth and wait for the update to finish

-Unplug AudioMoth and store until deployment

I get that portion. However, my confusion is moving forward with newer updates (or updating firmware with version 1.3.0 or newer). The AudioMoth Operation Manual states that a flash update can be done by plugging in your device, flashing, unplugging the device, and removing and reinserting batteries before use to cycle the power of a newly flashed AudioMoth. However, I have read on the support forum that batteries are not needed here as well. Which is correct? Do I need to insert batteries to flash my Audimoth, or are they not needed? Some clarification would be appreciation. Thanks in advance!