arm-poky-linux-gnueabi-strip:nginx: File format not recognized

This error message indicates that the file format of the "nginx" binary is not recognized by the "arm-poky-linux-gnueabi-strip" tool.

There could be several reasons for this error, including:

1. The "nginx" binary may be corrupted or incomplete.
2. The "arm-poky-linux-gnueabi-strip" tool may not be compatible with the version of the "nginx" binary.
3. The "nginx" binary may be compiled for a different CPU architecture or operating system.

To resolve this issue, you can try the following steps:

1. Make sure that the "nginx" binary is a valid executable file and is not corrupted or incomplete.
2. Check the compatibility of the "arm-poky-linux-gnueabi-strip" tool with the version of the "nginx" binary.
3. Ensure that the "nginx" binary is compiled for the same CPU architecture and operating system as the target device.
4. Try using a different version of the "arm-poky-linux-gnueabi-strip" tool or a different tool for stripping binaries.