Depending on the age of your Mac, it contains a small amount of special memory called NVRAM (Non-Volatile RAM) or PRAM (Parameter RAM).
Both store settings used by your Mac to control the configuration of various systems and devices.
To do: Need to reorganize as (1) General installation, (2) Device specific addenda, (3) Configuration adjuncts and recipes (adding features), (4) Config & operational notes on various topics -- Wrlee (talk) , 31 July 2009 (UTC) Once installed, you can load any other firmware file without these machinations, using the config menu item to load new (or old) versions of firmware, including OEM versions.
As noted above, the USB port is not supported by the standard Tomato firmware.
For this reason, it is best to perform the installation in a stable environment and not in a location with rapidly and unpredictably shifting conditions, such as a disaster zone.
If you are operating in a remote location or if internet access is mission-critical, always have a backup router ready for use in the event of problems.
Obtaining the installation file Before you begin the upgrade you will need to download the latest firmware file that you will be installing from Before you begin, print this document and make sure that you have the upgrade file.
You will not have internet access during the installation.
Once the jumpers are correctly set and power is supplied this will then reset the BIOS on the system. The NVRAM will be cleared when the jumper is closed (use the jumper from the password bridge (PSWD)).
To properly clear; AC power must be applied (not necessarily turned on) to the system for about 10 seconds while the jumper is closed.
Pins 1-2 once shorted will clear NVRAM and reset all ESCD Settings This is another method that can be used to reset the BIOS on the system by simply removing the CMOS coin cell battery and then clearing power from the system.
This is commonly done if you cannot access the jumpers or if you are dealing with a laptop system.
The difference between NVRAM and PRAM is mostly superficial.