Pribislav posted this in another thread, the paper isn't published and there's no pre-print or anything yet but it's part of some upcoming big study on Roman and Medieval age in Balkans and surrounds I guess. Apparently a few I1s have been found already in Serbia.

Viminacium - 28 (labeled Serbia_Roman):

E x 13 (L618 x 6; L618>V13 x 3; Z830 x 1; Z830>M123 x 1; Z1902 x 1; M96 x 1)

G x 5 (PF3148 x 1; PF3148>L91 x 1; P303 x 1; L497 x 1; L497>Z1815 x 1)

R1b x 3 (Z2103 x 1; U106 x 1; U152>L2>Z367 x 1)

R1a x 2 (Z2124>Z2122 x 1; Z2124>Z2123 x 1)

J x 2 (M304 x 1; L24 x 1)

T x 1 (M184)

I1 x 1 (M253)

I2 x 1 (L596)

Timacum Minus, Slog necropolis - 10 (labeled Serbia_Roman):

E x 3 (M35 x 1; L618 x 1; L618>V13 x 1)

J x 3 (M304 x 1; M410 x 1; M241 x 1)

R1b x 2 (Z2103 x 1; Z2103>CTS1450 x 1)

G x 1 (CTS342>FGC12126)

I1 x 1 (Z58>CTS8647)

Timacum Minus, Kuline necropolis - 5 (labeled Serbia_Early_Middle_Age):

I2 x 2 (M423 x 2)

E x 1 (L618)

J x 1 (M304)

R1b x 1 (P312>DF99)

Lepenski Vir - 2:

E x 1 (M35) - Serbia_Roman

J x 1 (M102) - Serbia_Medieval

Mediana - 2 (labeled Serbia_Gepid):

G x 1 (P287)

I1 x 1 (Z58>CTS8647)

Gomolava - 1 (labeled Serbia_Medieval):

I2 x 1 (M423>L621>CTS4002)