Updates to Odroid Go Ultra install docs

docs/devices/hardkernel/odroid-go-ultra.md

@@ -18,29 +18,38 @@
 
 ### Installation
 
-Download the latest `S922X-Odroid_GOU` version of JELOS from the button below.
+First download the latest `S922X-Odroid_GOU` version of JELOS from the button below.
-
-!!! note "JELOS must be flashed directly onto the Odroid Go Ultra rather than an SD card.  This is done by putting the device into recovery mode, [as explained here](https://youtu.be/X9wbPY5qf6o?t=1195)."
 
 [![Latest Version](https://img.shields.io/github/release/JustEnoughLinuxOS/distribution.svg?labelColor=111111&color=5998FF&label=Latest&style=flat#only-light)](https://github.com/JustEnoughLinuxOS/distribution/releases/latest)
 [![Latest Version](https://img.shields.io/github/release/JustEnoughLinuxOS/distribution.svg?labelColor=dddddd&color=5998FF&label=Latest&style=flat#only-dark)](https://github.com/JustEnoughLinuxOS/distribution/releases/latest)
 
+There are 2 options for installing JELOS on the Odroid Go Ultra:
+1. Install JELOS directly to the 16 GB onboard EMMC memory and use the microSD card slot for ROMS; or
+2. Zero-fill the onboard EMMC memory, install JELOS to a microSD card and load ROMS / games onto the same microSD card.
+
+Option 1 is recommended as it makes the most of available storage and allows separation of the operating system (on EMMC) and ROMS / games (on microSD). However Option 2 may come in handy if you would like to run different versions of JELOS installed to different microSD cards.
+
+For either option, you will need to boot the Odroid Go Ultra into recovery mode. To do this, follow the steps on [the Odroid wiki](https://wiki.odroid.com/odroid_go_ultra/getting_started/installing_os_image#installation).
+
+#### Option 1 - Install JELOS to EMMC
+- Once booted in recovery mode and connected to a PC via USB-C, the JELOS image may be flashed to the EMMC using Balena Etcher, win32diskimager, dd or similar.
+- Restart the device and JELOS will go through its first boot process (running from EMMC).
+
+#### Option 2 - Zero-fill EMMC and install JELOS to microSD
+- Once booted in recovery mode and connected to a PC via USB-C, EMMC may be zero-filled, perhaps using dd, for example `dd if=/dev/zero of=/dev/<emmc_device_node> bs=1M`.
+- Write the JELOS image to a microSD card using dd or similar.
+- Power off the device, insert the JELOS microSD card, power on the device and JELOS will go through its first boot process (running from microSD).
+
 ### Troubleshooting
 
 You cannot brick this device. If you cannot get into recovery mode, do the following:
 
 - Download [this recovery image](https://wiki.odroid.com/odroid_go_ultra/os_image/recovery).
-- Flash the image to a spare microSD card using Balena Etcher or similar.
+- Follow the recovery steps on [the Odroid wiki](https://wiki.odroid.com/odroid_go_ultra/getting_started/recovery_emmc)
-- Remove the back cover of the device (four screws).
-- Locate a small button on the back of the board (the side that's visible), near the right thumbstick.
-- While holding down the small button, power on the device.
 
 The device should now be in recovery mode, ready to flash JELOS (or other firmware) to the device.
 
-If you find yourself doing this often, consider drilling a pinhole in the back cover so that the button can be accessed with a paperclip.
-
-![](../../_inc/images/devices/mods/powkiddy-rgb10max3pro-mod1.png){ .off-glb }
-
 ## Additional References
 
-- [Platform Documentation (S922X)](https://github.com/JustEnoughLinuxOS/distribution/blob/main/documentation/PER_DEVICE_DOCUMENTATION/S922X)
+- [Platform Documentation (S922X)](https://github.com/JustEnoughLinuxOS/distribution/blob/main/documentation/PER_DEVICE_DOCUMENTATION/S922X)
+- [Odroid Go Ultra wiki](https://wiki.odroid.com/odroid_go_ultra/odroid_go_ultra)