After successfully reverse engineering a two-layer board, I wondered: can I do the same with a four-layer board?

I chose a four-layer board with larger components: SMD resistors and SMD capacitors no smaller than 0805.

The board is automotive-grade: for AdBlue pump control.

For this project, I used Sprint Layout 6.0 — I didn't use Inkscape for the design.

Unfortunately, so far I haven't been able to locate the files I created with Sprint Layout 6.0.

I'm attaching photos. The board is 4-layer and quite thick: it took quite a bit of sanding to reach the inner layers.

Layer 1 - TOP , with components.

Layer 1 - TOP , with components and  with the component designations.

Layer 1 - TOP , without components.

Layer 1 - TOP ,  with the component designations.

Layer 2 - Inner layer.

Layer 3 - Inner layer.

Layer 4 - BOT , with components.

Layer 4 - BOT , with components and  with the component designations.

Layer 4 - BOT , without components.

Layer 4 - BOT ,  with the component designations.

Components : TOP and BOT .

Components : TOP and BOT + component designations.

Components : TOP and BOT , wthout picture : component designations.

Next project will be 4 layers pcb with 0402 compоnents and drawn layers on SVG format.