Can the small size of the board affect the ease of assembly?

No. It mostly depends on the case. So long as your cpu cooler is compatible with the motherboard, you'll be fine. Plug in your connectors before your cpu cooler and you'll be good.

Does the ASRock A620I LIGHTNING WIFI motherboard have a compact design?

Yes, the ASRock A620I LIGHTNING WIFI motherboard has a compact design as it is a Mini-ITX form factor measuring 6.7 inches by 6.7 inches.

BIOS FLASHBACK FOR RYZEN 9000 ?

Yes. Instructions are on page 48 of the user manual. You will need to update the BIOS to version 3.1 (at least).

Questions & Answers: ASRock A620I LIGHTNING WIFI AM5 Ryzen7000 AMD A620 SATA 6Gb/s Mini-ITX Dual Channel DDR5 - 2.5G LAN, 802.11ax Wi-Fi 6E Module PCIe 4.0 x16 Slot Motherboards - AMD

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ASRock A620I LIGHTNING WIFI AM5 Ryzen7000 AMD A620 SATA 6Gb/s Mini-ITX Dual Channel DDR5 - 2.5G LAN, 802.11ax Wi-Fi 6E Module PCIe 4.0 x16 Slot Motherboards - AMD

Supports AMD Socket AM5 Ryzen 7000 Series
Processors
Phantom Gaming 2.5Gb/s LAN is built for maximum networking
performance for online gamers and high-quality streaming media.
Flexible Integrated I/O Shield: Perfectly ts chassis without issues
Hyper M.2 For SSD: Supports the PCI Express 4.0 M.2 SSDs, it is capable of
perform twice the speed compared to previous 3rd generation.
WiFi 6E (802.11ax) Better and faster internet traffic with lower latency
Supports DDR5 7200+ (OC)
1 PCIe 4.0 x16
Graphics Output Options: HDMI
Realtek ALC897 7.1 CH HD Audio Codec,
Nahimic Audio
Phantom Gaming 2.5G LAN
802.11ax WiFi 6E + Bluetooth
Supports ASRock Auto Driver Installer, BIOS Flashback

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