In which year did James Prinsep decipher the Brahmi Script?

NCERT (2026-27): “7.1 Deciphering Brahmi … European scholars aided by Indian pandits worked backwards from contemporary Bengali and Devanagari (the script used to write Hindi) manuscripts, comparing their letters with older specimens. Scholars who studied early inscriptions sometimes assumed these were in Sanskrit, although the earliest inscriptions were, in fact, in Prakrit. It was only after decades of painstaking investigations by several epigraphists that James Prinsep was able to decipher Asokan Brahmi in 1838.…”