Question in Q&A please instead of Howto's and tutorials.
Please read firmware upgrading howto carefully and follow instructions carefully.
Further:
- Make sure you unpack the .zip file before upgrading (upgrade the .trx file)
- Check if the firmware is okay for your device. e.g. you can't load a firmware for the wl-500g into a wl-500.
- Do not use wireless for upgrading, but allways use a wired connection.