Firmware set for the HP EliteBook 745 G6, codename TENJIN, board 6050A3044201 with MB A01 and A1 markings, Ryzen 5 PRO variant.

PDF of the bottom side for LCFC board NM-A181 at revision 1.0, a Lenovo design whose name marks it as the BOT layer.

Lenovo Flex 14 and Flex 15 boardview for the ST6 mainboard, Quanta board DAOST6MB6E0, in a 991 KB ZIP.

Bottom copper layer of the R2 power amplifier PCB rated 1500 watts at 2 ohms, marked langsung print, Indonesian for direct print.

Bottom copper artwork for the Matrix i4 amplifier board rated 250 watts at 4 ohms, labelled langsung print, meaning ready for direct printing.

Bottom-side component placement sheet for the LCFC NM-C421 board used in Lenovo laptops, a 112 KB PDF that complements the matching top-side drawing.

Mirrored bottom-layer placement sheet in PDF for the MI2 board at the P4 build. Mirroring flips the view so the underside appears as it looks when the board is turned…

Bottom-side placement drawing in PDF for the Xiaomi M1s board at the P3 build stage. It shows where components and their designators sit on the underside, so a part…

Boardview for a Lenovo mainboard NM-A251, with NM-A252 also referenced; the BOT tag suggests a bottom-side layer view.

Small 183 KB PDF for the Apple iPad 3, whose name suggests top and bottom views of the board, so it likely functions more as a component placement map than a full…

Bottom-side placement drawing for the Compal LA-F391P board, a 106 KB PDF that pairs with the top-side view and the full BRMLK12U schematic.

Bottom-side placement drawing for Compal-made motherboard LA-8821P, a 584 KB PDF. The name does not state the laptop brand, model or board revision.

Boardview for the Dell G3 3579 laptop, based on the Compal LA-F611P motherboard, revision 1.0, with both top and bottom sides included, compressed in 7z format.

Bottom-side PCB layout for the R2 amplifier design rated 500 watts at 4 ohms, stored as a 138 KB PDF.

Bottom-side placement view for the Compal LA-F541P board, a 445 KB PDF that complements the matching top-side file.

Bottom-side PDF for Wistron-numbered board 15250-1, roughly 263 KB, the counterpart of the top-side sheet.

Bottom-side companion PDF for the Lenovo NM-B311 board, LCFC numbering, at roughly 501 KB, showing component placement on the underside of the PCB.

BIOS package for the HP Pavilion 15-n010tx built on the Quanta U81 platform, board number DA0U81MB6C0.

Firmware for a Hansung A36X notebook with board code U931, marked BOT MB, NPB, version E. The tokens appear to identify the bottom main board and its PCB version.

Small 138 KB PDF for Lenovo board NM-A181, revision 1.0, with AILZA as the project code; the name marks it as the bottom side, so it is most likely a component placement…

BIOS dump for the HP EliteBook 840 G6, code name Crescent, on the 6050A3022501 mainboard, marked revision A01A1.

RAR archive of about 19.3 MB listed as BIOS or firmware, but its name refers to a trading bot and a discount and says nothing about any device, board or chip.

Firmware archive for an AGB notebook with the label Octev AB 1210. The name also carries an OLD tag, a date that appears to be 14-8-24, BOT and a version string V1.03…

PDF drawing of the bottom side of board 15341-1, a number in the Wistron pattern, about 219 KB.

Bottom-side PDF sheet for motherboard 14291-1, numbered in the Wistron style used for many Dell notebook boards.