Do not search for "F1 download." Instead, note the text style (e.g., Japanese body text). Step 2: Download Source Han Serif from the official GitHub (free link above). Step 3: Install the font. Restart Illustrator. Step 4: Select the text with the F1 error. Step 5: Go to Type → Resolve Missing Fonts . Step 6: Map F1 → Source Han Serif Regular . Step 7: Check "Permanent" to save the mapping.
– Many OSes include CID‑compatible fonts already (e.g., Microsoft YaHei , AppleGothic , Noto Sans CJK ) cid font f1 f2 f3 free download link
In Adobe Acrobat, go to File > Properties > Fonts to see if the real font name is listed next to the "F1" or "F2" tag. Do not search for "F1 download