How to update firmware on Easysolar 1600/24?

How to updated firmware on easysolar all in one 1600/24 without the gx
Using smartphone. The unit has 2 rg45 connections.

Without a GX device you need a MK3 interface.

VictronConnect manual:
https://www.victronenergy.com/media/pg/VictronConnect_configuration_guide_for_VE.Bus_products/en/firmware-updates.html

If the current FW is below415 you need to use VEflash:
https://www.victronenergy.com/live/updating_firmware:updating_ve.bus_products

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Mk3 does not connect to phone. Any other way to do the update using a phone

No, read the manuals.

There is also a MK3 with USB-C available.

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You can if you phone has the ability have a usb to otg adaptor. That is how i use mine with the usb mk3

Mk3 for some reason does not work

The ending of 154 is the firmware number (if it is never been updated) too old for victron connect and a phone.
M_Lange’s advice is the one to use with a laptop.

the Mk3 with USB C does not work on my iPhone (I believe this is documented as not supported) however it does work via USB C on my Mac and on Android - tested and verified