Mini

The Meraki Mini router has 54mbps WiFi, 1 100mbps ETH-ports and 0 USB-ports. It also supports custom firmwares like: dd-wrt, OpenWrt

Quick links:
Default password/Login
User Manuals
Flashing Custom Firmwares

Mini router specifications (specs)

System specs
CPU: 180 MHz
RAM: 32 MiB
Flash: 8 MiB
Custom firmwares: dd-wrt, OpenWrt

Connectivity
WiFi: 54mbps (bg)
WiFi bands: 2.4GHz
WiFi throughput: n/a
WAN: None
ETH: 1 x 100mbps port
USB-ports: 0

Hard reset instructions for Meraki Mini

If your Mini router is not working as it should, dropping connections or not being responsive, you should first do a reset of the router to see if the problems persist. Other scenarios where you might want to reset your router is if you've forgotten the password or misconfigured it and can't get access anymore.
Your can reset your Meraki Mini in the following way(s):

The 30-30-30 reset

There are no specific instructions for this model yet, but you can always do the 30-30-30 reset as follows:

When router is powered on, press the reset button and hold for 30 seconds. (Use a paper clip or something sharp)
While holding the reset button pressed, unplug the power of the router and hold the reset button for 30 seconds
While still holding the reset button down, turn on the power to the unit again and hold for another 30 seconds.

This process usually works for resetting any router to it's factory setting.

Note: It is worth reading more about how to reset routers with the 30 30 30 reset and what the risks and considerations are when resetting your router this way, instead of just rebooting it.

Default factory settings for Meraki Mini

If you have performed a reset of your Mini device or not changed the defaults, you should be able to access it with the following settings:

Default Network name (SSID): meraki
Default Gateway IP: 192.168.85.1 Meraki login instructions
Default subnet mask: 255.255.255.0
Default DNS server: 192.168.85.1
Note: If you are using the default settings you should change them to increase security and prevent unathorized access to your network.

Mini Firmwares

Staying up to date with the latest firmware is a good idea to keep your router even more secure from various security flaws.
If you want to squeeze a little bit of extra functionality out of your router, consider flashing an open-source firmware like dd-wrt, openWRT or LEDE. Flashing a custom ROM can greatly increase the stability and functionality of your old router.
Following are the firmwares that we have identified existing for the Meraki Mini:

Flashing dd-wrt on the Meraki Mini

We haven't find any specific instructions for flashin dd-wrt onto the Meraki Mini, but you can read the Installation guide over at dd-wrt to get a clue on how to proceed (As this model is listed as supported).
Note: Always make sure to read the wiki and howtos of dd-wrt before doing any flashing.

Flashing OpenWrt on the Meraki Mini

The Meraki Mini is supported by OpenWrt according to their Table of Hardware. So flashing OpenWrt onto it should be quite straigthforward.
We couldn't find any specific instructions for flashin OpenWrt on the Meraki Mini, but since it's listed in their Table of Hardware as supported, you can head over to the OpenWrt install instructions and read on there.
Note: Flashing custom firmwares is always on you're on own risk. Make sure to read OpenWrt's wikis to understand the risks and how to proceed if something goes wrong.