How to place in boot mode? (Flash mode)

Trying to flash one of the LILYGO T beams to update the firmware to the current version. Im getting a message to put it in boot mode by jumping the boot0 and gnd pins. I’m not seeing a boot0 pin. Any have an idea? Also, anyone know when the iPhone version will be out of beta and hopefully have OTA updates? This is driving me nuts. Thanks.