Update download.md

Author: peterwang2050

docs/rock5/rock5b/download.md

@@ -195,7 +195,7 @@ L2203 L2205 L2300 L2301 L2303 改成 3225 封装的 RHP322512T-R24M
 - [v1.2 原理图 pdf](https://dl.radxa.com/rock5/5b+/docs/hw/radxa_rock5bp_v1.2_schematic.pdf)
 - [v1.2 位号图 pdf](https://dl.radxa.com/rock5/5b+/docs/hw/radxa_rock5bp_v1.2_components_placement_map.pdf)
 - [v1.2 2D DXF](https://dl.radxa.com/rock5/5b+/docs/hw/radxa_rock5bp_v12_2d.zip)
-- [v1.2 3D STP](https://dl.radxa.com/rock5/5b+/docs/hw/radxa_rock5bp_v1.2_3d_stp.zip)
+- [v1.2 3D STP](https://dl.radxa.com/rock5/5b+/docs/hw/rock5bp_pcba_3d_V1_2_20250314.stp)
 
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