Very early production games needed a new SD card (see below) before updating. You could try updating your game or check with Stern tech support first.

From a Stern service bulletin -

In order to assure a successful update to code version 1.51 on Whoa Nellie games, please be sure that your game is at code revision level v1.50 prior to attempting the update to v1.51. Version 1.50 was sent to all customers as an SD card in order to facilitate installation. If you did not receive the v1.50 update kit from your dealer or distributor please contact Stern Technical Support at 1-800-KICKERS and we will send you the appropriate SD card. As always, please follow update instructions.

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